how to cite literature in a scientific paper

The CSE Manual for Authors, Editors, and Publishers

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• SCIENTIFIC STYLE AND FORMAT CITATION QUICK GUIDE

Scientific Style and Format Citation Quick Guide

Scientific Style and Format presents three systems for referring to references (also known as citations) within the text of a journal article, book, or other scientific publication: 1) citation–sequence; 2) name–year; and 3) citation–name. These abbreviated references are called in-text references. They refer to a list of references at the end of the document.

The system of in-text references that you use will determine the order of references at the end of your document. These end references have essentially the same format in all three systems, except for the placement of the date of publication in the name–year system.

Though Scientific Style and Format now uses citation–sequence for its own references, each system is widely used in scientific publishing. Consult your publisher to determine which system you will need to follow.

Click on the tabs below for more information and to see some common examples of materials cited in each style, including examples of electronic sources. For numerous specific examples, see Chapter 29 of the 8th edition of Scientific Style and Format .

Citation–Sequence and Citation–Name

The following examples illustrate the citation–sequence and citation–name systems. The two systems are identical except for the order of references. In both systems, numbers within the text refer to the end references.

In citation–sequence, the end references are listed in the sequence in which they first appear within the text. For example, if a reference by Smith is the first one mentioned in the text, then the complete reference to the Smith work will be number 1 in the end references. The same number is used for subsequent in-text references to the same document.

In citation–name, the end references are listed alphabetically by author. Multiple works by the same author are listed alphabetically by title. The references are numbered in that sequence, such that a work authored by Adam is number 1, Brown is number 2, and so on. Numbers assigned to the end references are used for the in-text references regardless of the sequence in which they appear in the text of the work. For example, if a work by Zielinski is number 56 in the reference list, each in-text reference to Zielinski will be number 56 also.

List authors in the order in which they appear in the original text, followed by a period. Periods also follow article and journal title and volume or issue information. Separate the date from volume and issue by a semicolon. The location (usually the page range for the article) is preceded by a colon.

Author(s). Article title. Journal title. Date;volume(issue):location.

Journal titles are generally abbreviated according to the List of Title Word Abbreviations maintained by the ISSN International Centre. See Appendix 29.1 in Scientific Style and Format for more information.

For articles with more than 1 author, names are separated by a comma.

Smart N, Fang ZY, Marwick TH. A practical guide to exercise training for heart failure patients. J Card Fail. 2003;9(1):49–58.

For articles with more than 10 authors, list the first 10 followed by “et al.”

Pizzi C, Caraglia M, Cianciulli M, Fabbrocini A, Libroia A, Matano E, Contegiacomo A, Del Prete S, Abbruzzese A, Martignetti A, et al. Low-dose recombinant IL-2 induces psychological changes: monitoring by Minnesota Multiphasic Personality Inventory (MMPI). Anticancer Res. 2002;22(2A):727–732.

Volume with no issue or other subdivision

Laskowski DA. Physical and chemical properties of pyrethroids. Rev Environ Contam Toxicol. 2002;174:49–170.

Volume with issue and supplement

Gardos G, Cole JO, Haskell D, Marby D, Paine SS, Moore P. The natural history of tardive dyskinesia. J Clin Pharmacol. 1988;8(4 Suppl):31S–37S

Volume with supplement but no issue

Heemskerk J, Tobin AJ, Ravina B. From chemical to drug: neurodegeneration drug screening and the ethics of clinical trials. Nat Neurosci. 2002;5 Suppl:1027–1029.

Multiple issue numbers

Ramstrom O, Bunyapaiboonsri T, Lohmann S, Lehn JM. Chemical biology of dynamic combinatorial libraries. Biochim Biophys Acta. 2002;1572(2–3):178–186.

Issue with no volume

Sabatier R. Reorienting health and social services. AIDS STD Health Promot Exch. 1995;(4):1–3.

Separate information about author(s), title, edition, and publication by periods. The basic format is as follows:

Author(s). Title. Edition. Place of publication: publisher; date. Extent. Notes.

Extent can include information about pagination or number of volumes and is considered optional. Notes can include information of interest to the reader, such as language of publication other than English; such notes are optional.

Essential notes provide information about location, such as a URL for online works. See Chapter 29 for more information.

For books with more than 1 author, names are separated by a comma.

Ferrozzi F, Garlaschi G, Bova D. CT of metastases. New York (NY): Springer; 2000.

For books with more than 10 authors, list the first 10 followed by “et al.”

Wenger NK, Sivarajan Froelicher E, Smith LK, Ades PA, Berra K, Blumenthal JA, Certo CME, Dattilo AM, Davis D, DeBusk RF, et al. Cardiac rehabilitation. Rockville (MD): Agency for Health Care Policy and Research (US); 1995.

Organization as author

Advanced Life Support Group. Acute medical emergencies: the practical approach. London (England): BMJ Books; 2001.

Author(s) plus editor(s) or translator(s)

Klarsfeld A, Revah F. The biology of death: origins of mortality. Brady L, translator. Ithaca (NY): Cornell University Press; 2003.

Luzikov VN. Mitochondrial biogenesis and breakdown. Galkin AV, translator; Roodyn DB, editor. New York (NY): Consultants Bureau; 1985.

Chapter or other part of a book, same author(s)

Gawande A. The checklist manifesto: how to get things right. New York (NY): Metropolitan Books; 2010. Chapter 3, The end of the master builder; p. 48–71.

Chapter or other part of a book, different authors

Rapley R. Recombinant DNA and genetic analysis. In: Wilson K, Walker J, editors. Principles and techniques of biochemistry and molecular biology. 7th ed. New York (NY): Cambridge University Press; 2010. p. 195–262.

Multivolume work as a whole

Alkire LG, editor. Periodical title abbreviations. 16th ed. Detroit (MI): Thompson Gale; 2006. 2 vol. Vol. 1, By abbreviation; vol. 2, By title.

Dissertations and Theses

Lutz M. 1903: American nervousness and the economy of cultural change [dissertation]. [Stanford (CA)]: Stanford University; 1989.

Blanco EE, Meade JC, Richards WD, inventors; Ophthalmic Ventures, assignee. Surgical stapling system. United States patent US 4,969,591. 1990 Nov 13.

Weiss R. Study shows problems in cloning people: researchers find replicating primates will be harder than other mammals. Washington Post (Home Ed.). 2003 Apr 11;Sect. A:12 (col. 1).

Indicate a copyright date with a lowercase “c”.

Johnson D, editor. Surgical techniques in orthopaedics: anterior cruciate ligament reconstruction [DVD]. Rosemont (IL): American Academy of Orthopaedic Surgeons; c2002. 1 DVD.

Websites and Other Online Formats

References to websites and other online formats follow the same general principles as for printed references, with the addition of a date of update/revision (if available) along with an access date and a URL.

Title of Homepage. Edition. Place of publication: publisher; date of publication [date updated; date accessed]. Notes.

If no date of publication can be determined, use a copyright date (if available), preceded by “c”. Include the URL in the notes.

APSnet: plant pathology. St Paul (MN): American Phytopathological Association; c1994–2005 [accessed 2005 Jun 20]. http://www.apsnet.org/.

Online journal article

Author(s) of article. Title of article. Title of journal (edition). Date of publication [date updated; date accessed];volume(issue):location. Notes.

A DOI (Digital Object Identifier) may be included in the notes in addition to a URL, if available:

Savage E, Ramsay M, White J, Beard S, Lawson H, Hunjan R, Brown D. Mumps outbreaks across England and Wales in 2004: observational study. BMJ. 2005 [accessed 2005 May 31];330(7500):1119–1120. http://bmj.bmjjournals.com/cgi/reprint/330/7500/1119. doi:10.1136/bmj.330.7500.1119.

Author(s). Title of book. Edition. Place of publication: publisher; date of publication [date updated; date accessed]. Notes.

Brogden KA, Guthmille JM, editors. Polymicrobial diseases. Washington (DC): ASM Press; 2002 [accessed February 28, 2014]. http://www.ncbi.nlm.nih.gov/books/NBK2475/.

Author’s name. Title of post [descriptive word]. Title of blog. Date of publication. [accessed date]. URL.

Fogarty M. Formatting titles on Twitter and Facebook [blog]. Grammar Girl: Quick and Dirty Tips for Better Writing. 2012 Aug 14. [accessed 2012 Oct 19]. http://grammar.quickanddirtytips.com/formatting-titles-on-twitter-and-facebook.aspx.

Forthcoming or Unpublished Material

Not all forthcoming or unpublished sources are suitable for inclusion in reference lists. Check with your publisher if in doubt.

Forthcoming journal article or book

Journal article:

Farley T, Galves A, Dickinson LM, Perez MJ. Stress, coping, and health: a comparison of Mexican immigrants, Mexican-Americans, and non-Hispanic whites. J Immigr Health. Forthcoming 2005 Jul.

Goldstein DS. Adrenaline and the inner world: an introduction to scientific integrative medicine. Baltimore (MD): Johns Hopkins University Press. Forthcoming 2006.

Paper or poster presented at meeting

Unpublished presentations are cited as follows:

Antani S, Long LR, Thoma GR, Lee DJ. Anatomical shape representation in spine x-ray images. Paper presented at: VIIP 2003. Proceedings of the 3rd IASTED International Conference on Visualization, Imaging and Image Processing; 2003 Sep 8–10; Benalmadena, Spain.

Charles L, Gordner R. Analysis of MedlinePlus en Español customer service requests. Poster session presented at: Futuro magnifico! Celebrating our diversity. MLA ’05: Medical Library Association Annual Meeting; 2005 May 14–19; San Antonio, TX.

References to published presentations are cited much like contributions to books, with the addition of information about the date and place of the conference. See Chapter 29 for more information.

Personal communication

References to personal communication are placed in running text rather than as formal end references.

Permission is usually required and should be acknowledged in an “Acknowledgment” or “Notes” section at the end of the document.

. . . and most of these meningiomas proved to be inoperable (2003 letter from RS Grant to me; unreferenced, see “Notes”) while a few were not.

Name–Year

The following examples illustrate the name–year system. In this system (sometimes called the Harvard system), in-text references consist of the surname of the author or authors and the year of publication of the document. End references are unnumbered and appear in alphabetical order by author and year of publication, with multiple works by the same author listed in chronological order.

Each example of an end reference is accompanied here by an example of a corresponding in-text reference. For more details and many more examples, see Chapter 29 of Scientific Style and Format .

For the end reference, list authors in the order in which they appear in the original text. The year of publication follows the author list. Use periods to separate each element, including author(s), date of publication, article and journal title, and volume or issue information. Location (usually the page range for the article) is preceded by a colon.

Author(s). Date. Article title. Journal title. Volume(issue):location.

For the in-text reference, use parentheses and list author(s) by surname followed by year of publication.

(Author(s) Year)

For articles with 2 authors, names are separated by a comma in the end reference but by “and” in the in-text reference.

Mazan MR, Hoffman AM. 2001. Effects of aerosolized albuterol on physiologic responses to exercise in standardbreds. Am J Vet Res. 62(11):1812–1817.

(Mazan and Hoffman 2001)

For articles with 3 to 10 authors, list all authors in the end reference; in the in-text reference, list only the first, followed by “et al.”

Smart N, Fang ZY, Marwick TH. 2003. A practical guide to exercise training for heart failure patients. J Card Fail. 9(1):49–58.

(Smart et al. 2003)

For articles with more than 10 authors, list the first 10 in the end reference, followed by “et al.”

Pizzi C, Caraglia M, Cianciulli M, Fabbrocini A, Libroia A, Matano E, Contegiacomo A, Del Prete S, Abbruzzese A, Martignetti A, et al. 2002. Low-dose recombinant IL-2 induces psychological changes: monitoring by Minnesota Multiphasic Personality Inventory (MMPI). Anticancer Res. 22(2A):727–732.

(Pizzi et al. 2002)

Laskowski DA. 2002. Physical and chemical properties of pyrethroids. Rev Environ Contam Toxicol. 174:49–170.

(Laskowski 2002)

Gardos G, Cole JO, Haskell D, Marby D, Paine SS, Moore P. 1988. The natural history of tardive dyskinesia. J Clin Pharmacol. 8(4 Suppl):31S–37S.

(Gardos et al. 1988)

Heemskerk J, Tobin AJ, Ravina B. 2002. From chemical to drug: neurodegeneration drug screening and the ethics of clinical trials. Nat Neurosci. 5 Suppl:1027–1029.

(Heemskerk et al. 2002)

Ramstrom O, Bunyapaiboonsri T, Lohmann S, Lehn JM. 2002. Chemical biology of dynamic combinatorial libraries. Biochim Biophys Acta. 1572(2–3):178–186.

(Ramstrom et al. 2002)

Sabatier R. 1995. Reorienting health and social services. AIDS STD Health Promot Exch. (4):1–3.

(Sabatier 1995)

In the end reference, separate information about author(s), date, title, edition, and publication by periods. The basic format is as follows:

Author(s). Date. Title. Edition. Place of publication: publisher. Extent. Notes.

Extent can include information about pagination or number of volumes and is considered optional. Notes can include information of interest to the reader, such as language of publication other than English; such notes are optional. Essential notes provide information about location, such as a URL for online works. See Chapter 29 for more information.

For books with 2 authors, names are separated by a comma in the end reference but by “and” in the in-text reference.

Leboffe MJ, Pierce BE. 2010. Microbiology: laboratory theory and application. Englewood (CO): Morton Publishing Company.

(Leboffe and Pierce 2010)

For books with 3 to 10 authors, list all authors in the end reference; in the in-text reference, list only the first, followed by “et al.”

Ferrozzi F, Garlaschi G, Bova D. 2000. CT of metastases. New York (NY): Springer.

(Ferrozzi et al. 2000)

For books with more than 10 authors, list the first 10 in the end reference, followed by “et al.”

Wenger NK, Sivarajan Froelicher E, Smith LK, Ades PA, Berra K, Blumenthal JA, Certo CME, Dattilo AM, Davis D, DeBusk RF, et al. 1995. Cardiac rehabilitation. Rockville (MD): Agency for Health Care Policy and Research (US).

(Wenger et al. 1995)

[ALSG] Advanced Life Support Group. 2001. Acute medical emergencies: the practical approach. London (England): BMJ Books.

(ALSG 2001)

Klarsfeld A, Revah F. 2003. The biology of death: origins of mortality. Brady L, translator. Ithaca (NY): Cornell University Press.

Luzikov VN. 1985. Mitochondrial biogenesis and breakdown. Galkin AV, translator; Roodyn DB, editor. New York (NY): Consultants Bureau.

(Klarsfeld and Revah 2003)

(Luzikov 1985)

Gawande A. 2010. The checklist manifesto: how to get things right. New York (NY): Metropolitan Books. Chapter 3, The end of the master builder; p. 48–71.

(Gawande 2010)

Rapley R. 2010. Recombinant DNA and genetic analysis. In: Wilson K, Walker J, editors. Principles and techniques of biochemistry and molecular biology. 7th ed. New York (NY): Cambridge University Press. p. 195–262.

(Rapley 2010)

Alkire LG, editor. 2006. Periodical title abbreviations. 16th ed. Detroit (MI): Thompson Gale. 2 vol. Vol. 1, By abbreviation; vol. 2, By title.

(Alkire 2006)

Lutz M. 1989. 1903: American nervousness and the economy of cultural change [dissertation]. [Stanford (CA)]: Stanford University.

(Lutz 1989)

Blanco EE, Meade JC, Richards WD, inventors; Ophthalmic Ventures, assignee. 1990 Nov 13. Surgical stapling system. United States patent US 4,969,591.

(Blanco et al. 1990)

Weiss R. 2003 Apr 11. Study shows problems in cloning people: researchers find replicating primates will be harder than other mammals. Washington Post (Home Ed.). Sect. A:12 (col. 1).

(Weiss 2003)

Johnson D, editor. c2002. Surgical techniques in orthopaedics: anterior cruciate ligament reconstruction [DVD]. Rosemont (IL): American Academy of Orthopaedic Surgeons. 1 DVD.

(Johnson c2002)

Format for end reference:

Title of Homepage. Date of publication. Edition. Place of publication: publisher; [date updated; date accessed]. Notes.

APSnet: plant pathology online. c1994–2005. St Paul (MN): American Phytopathological Association; [accessed 2005 Jun 20]. http://www.apsnet.org/.

For the in-text reference, include only the first word or two of the title (enough to distinguish it from other titles in the reference list), followed by an ellipsis.

(APSnet . . . c1994–2005)

Author(s) of article. Date of publication. Title of article. Title of journal (edition). [date updated; date accessed];Volume(issue):location. Notes.

Savage E, Ramsay M, White J, Beard S, Lawson H, Hunjan R, Brown D. 2005. Mumps outbreaks across England and Wales in 2004: observational study. BMJ. [accessed 2005 May 31];330(7500):1119–1120. http://bmj.bmjjournals.com/cgi/reprint/330/7500/1119. doi:10.1136/bmj.330.7500.1119.

(Savage et al. 2005)

Author(s). Date of publication. Title of book. Edition. Place of publication: publisher; [date updated; date accessed]. Notes.

Brogden KA, Guthmille JM, editors. 2002. Polymicrobial diseases. Washington (DC): ASM Press; [accessed February 28, 2014]. http://www.ncbi.nlm.nih.gov/books/NBK2475/.

(Brogden and Guthmille 2002)

Author’s name. Date of publication. Title of post [descriptive word]. Title of blog. [accessed date]. URL.

Fogarty M. 2012 Aug 14. Formatting titles on Twitter and Facebook [blog]. Grammar Girl: Quick and Dirty Tips for Better Writing. [accessed 2012 Oct 19]. http://grammar.quickanddirtytips.com/formatting-titles-on-twitter-and-facebook.aspx.

(Fogarty 2012)

Farley T, Galves A, Dickinson LM, Perez MJ. Forthcoming 2005 Jul. Stress, coping, and health: a comparison of Mexican immigrants, Mexican-Americans, and non-Hispanic whites. J Immigr Health.

(Farley et al. 2005)

Goldstein DS. Forthcoming 2006. Adrenaline and the inner world: an introduction to scientific integrative medicine. Baltimore (MD): Johns Hopkins University Press.

(Goldstein 2006)

Antani S, Long LR, Thoma GR, Lee DJ. 2003. Anatomical shape representation in spine x-ray images. Paper presented at: VIIP 2003. Proceedings of the 3rd IASTED International Conference on Visualization, Imaging and Image Processing; Benalmadena, Spain.

Charles L, Gordner R. 2005. Analysis of MedlinePlus en Español customer service requests. Poster session presented at: Futuro magnifico! Celebrating our diversity. MLA ’05: Medical Library Association Annual Meeting; San Antonio, TX.

(Atani et al. 2003)

(Charles and Gordner 2005)

References to personal communication are placed in running text rather than as formal end references. Permission is usually required and should be acknowledged in an “Acknowledgment” or “Notes” section at the end of the document.

Scientific Style and Format, 8th Edition text © 2014 by the Council of Science Editors. Scientific Style and Format Online © 2014 by the Council of Science Editors.

Citing sources: Overview

• Citation style guides

Manage your references

Use these tools to help you organize and cite your references:

• Citation Management and Writing Tools

If you have questions after consulting this guide about how to cite, please contact your advisor/professor or the writing and communication center .

Why citing is important

It's important to cite sources you used in your research for several reasons:

• To show your reader you've done proper research by listing sources you used to get your information
• To be a responsible scholar by giving credit to other researchers and acknowledging their ideas
• To avoid plagiarism by quoting words and ideas used by other authors
• To allow your reader to track down the sources you used by citing them accurately in your paper by way of footnotes, a bibliography or reference list

About citations

Citing a source means that you show, within the body of your text, that you took words, ideas, figures, images, etc. from another place.

Citations are a short way to uniquely identify a published work (e.g. book, article, chapter, web site).  They are found in bibliographies and reference lists and are also collected in article and book databases.

Citations consist of standard elements, and contain all the information necessary to identify and track down publications, including:

• author name(s)
• titles of books, articles, and journals
• date of publication
• page numbers
• volume and issue numbers (for articles)

Citations may look different, depending on what is being cited and which style was used to create them. Choose an appropriate style guide for your needs.  Here is an example of an article citation using four different citation styles.  Notice the common elements as mentioned above:

Author - R. Langer

Article Title - New Methods of Drug Delivery

Source Title - Science

Volume and issue - Vol 249, issue 4976

Publication Date - 1990

Page numbers - 1527-1533

American Chemical Society (ACS) style:

Langer, R. New Methods of Drug Delivery. Science 1990 , 249 , 1527-1533.

IEEE Style:

R. Langer, " New Methods of Drug Delivery," Science , vol. 249 , pp. 1527-1533 , SEP 28, 1990 .

American Psychological Association   (APA) style:

Langer, R. (1990) . New methods of drug delivery. Science , 249 (4976), 1527-1533.

Modern Language Association (MLA) style:

Langer, R. " New Methods of Drug Delivery." Science 249.4976 (1990) : 1527-33.

What to cite

You must cite:

• Facts, figures, ideas, or other information that is not common knowledge

Publications that must be cited include:  books, book chapters, articles, web pages, theses, etc.

Another person's exact words should be quoted and cited to show proper credit 

When in doubt, be safe and cite your source!

Avoiding plagiarism

Plagiarism occurs when you borrow another's words (or ideas) and do not acknowledge that you have done so. In this culture, we consider our words and ideas intellectual property; like a car or any other possession, we believe our words belong to us and cannot be used without our permission.

Plagiarism is a very serious offense. If it is found that you have plagiarized -- deliberately or inadvertently -- you may face serious consequences. In some instances, plagiarism has meant that students have had to leave the institutions where they were studying.

The best way to avoid plagiarism is to cite your sources - both within the body of your paper and in a bibliography of sources you used at the end of your paper.

Some useful links about plagiarism:

• MIT Academic Integrity Overview on citing sources and avoiding plagiarism at MIT.
• Avoiding Plagiarism From the MIT Writing and Communication Center.
• Plagiarism: What It is and How to Recognize and Avoid It From Indiana University's Writing Tutorial Services.
• Plagiarism- Overview A resource from Purdue University.
• Next: Citation style guides >>
• Last Updated: Jan 16, 2024 7:02 AM
• URL: https://libguides.mit.edu/citing

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• Knowledge Base
• Referencing

A Quick Guide to Referencing | Cite Your Sources Correctly

Referencing means acknowledging the sources you have used in your writing. Including references helps you support your claims and ensures that you avoid plagiarism .

There are many referencing styles, but they usually consist of two things:

• A citation wherever you refer to a source in your text.
• A reference list or bibliography at the end listing full details of all your sources.

The most common method of referencing in UK universities is Harvard style , which uses author-date citations in the text. Our free Harvard Reference Generator automatically creates accurate references in this style.

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Table of contents

Referencing styles, citing your sources with in-text citations, creating your reference list or bibliography, harvard referencing examples, frequently asked questions about referencing.

Each referencing style has different rules for presenting source information. For in-text citations, some use footnotes or endnotes , while others include the author’s surname and date of publication in brackets in the text.

The reference list or bibliography is presented differently in each style, with different rules for things like capitalisation, italics, and quotation marks in references.

Your university will usually tell you which referencing style to use; they may even have their own unique style. Always follow your university’s guidelines, and ask your tutor if you are unsure. The most common styles are summarised below.

Harvard referencing, the most commonly used style at UK universities, uses author–date in-text citations corresponding to an alphabetical bibliography or reference list at the end.

Harvard Referencing Guide

Vancouver referencing, used in biomedicine and other sciences, uses reference numbers in the text corresponding to a numbered reference list at the end.

Vancouver Referencing Guide

APA referencing, used in the social and behavioural sciences, uses author–date in-text citations corresponding to an alphabetical reference list at the end.

APA Referencing Guide APA Reference Generator

MHRA referencing, used in the humanities, uses footnotes in the text with source information, in addition to an alphabetised bibliography at the end.

MHRA Referencing Guide

OSCOLA referencing, used in law, uses footnotes in the text with source information, and an alphabetical bibliography at the end in longer texts.

OSCOLA Referencing Guide

Prevent plagiarism, run a free check.

In-text citations should be used whenever you quote, paraphrase, or refer to information from a source (e.g. a book, article, image, website, or video).

Quoting and paraphrasing

Quoting is when you directly copy some text from a source and enclose it in quotation marks to indicate that it is not your own writing.

Paraphrasing is when you rephrase the original source into your own words. In this case, you don’t use quotation marks, but you still need to include a citation.

In most referencing styles, page numbers are included when you’re quoting or paraphrasing a particular passage. If you are referring to the text as a whole, no page number is needed.

In-text citations

In-text citations are quick references to your sources. In Harvard referencing, you use the author’s surname and the date of publication in brackets.

Up to three authors are included in a Harvard in-text citation. If the source has more than three authors, include the first author followed by ‘ et al. ‘

The point of these citations is to direct your reader to the alphabetised reference list, where you give full information about each source. For example, to find the source cited above, the reader would look under ‘J’ in your reference list to find the title and publication details of the source.

Placement of in-text citations

In-text citations should be placed directly after the quotation or information they refer to, usually before a comma or full stop. If a sentence is supported by multiple sources, you can combine them in one set of brackets, separated by a semicolon.

If you mention the author’s name in the text already, you don’t include it in the citation, and you can place the citation immediately after the name.

• Another researcher warns that the results of this method are ‘inconsistent’ (Singh, 2018, p. 13) .
• Previous research has frequently illustrated the pitfalls of this method (Singh, 2018; Jones, 2016) .
• Singh (2018, p. 13) warns that the results of this method are ‘inconsistent’.

The terms ‘bibliography’ and ‘reference list’ are sometimes used interchangeably. Both refer to a list that contains full information on all the sources cited in your text. Sometimes ‘bibliography’ is used to mean a more extensive list, also containing sources that you consulted but did not cite in the text.

A reference list or bibliography is usually mandatory, since in-text citations typically don’t provide full source information. For styles that already include full source information in footnotes (e.g. OSCOLA and Chicago Style ), the bibliography is optional, although your university may still require you to include one.

Format of the reference list

Reference lists are usually alphabetised by authors’ last names. Each entry in the list appears on a new line, and a hanging indent is applied if an entry extends onto multiple lines.

Different source information is included for different source types. Each style provides detailed guidelines for exactly what information should be included and how it should be presented.

Below are some examples of reference list entries for common source types in Harvard style.

• Chapter of a book
• Journal article

Your university should tell you which referencing style to follow. If you’re unsure, check with a supervisor. Commonly used styles include:

• Harvard referencing , the most commonly used style in UK universities.
• MHRA , used in humanities subjects.
• APA , used in the social sciences.
• Vancouver , used in biomedicine.
• OSCOLA , used in law.

Your university may have its own referencing style guide.

If you are allowed to choose which style to follow, we recommend Harvard referencing, as it is a straightforward and widely used style.

References should be included in your text whenever you use words, ideas, or information from a source. A source can be anything from a book or journal article to a website or YouTube video.

If you don’t acknowledge your sources, you can get in trouble for plagiarism .

To avoid plagiarism , always include a reference when you use words, ideas or information from a source. This shows that you are not trying to pass the work of others off as your own.

You must also properly quote or paraphrase the source. If you’re not sure whether you’ve done this correctly, you can use the Scribbr Plagiarism Checker to find and correct any mistakes.

Harvard referencing uses an author–date system. Sources are cited by the author’s last name and the publication year in brackets. Each Harvard in-text citation corresponds to an entry in the alphabetised reference list at the end of the paper.

Vancouver referencing uses a numerical system. Sources are cited by a number in parentheses or superscript. Each number corresponds to a full reference at the end of the paper.

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References: How to Cite and List Correctly

• First Online: 25 February 2021

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• C. George Thomas 2  

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When we write an essay, research paper, thesis, or book, it is normal to include information from the work of others or support our arguments by reference to other published works. All such academic documents draw heavily on the ideas and findings of previous and current researchers available through various sources such as books, journals, theses, newspapers, magazines, government reports, or Internet sources. In all these cases, proper referencing is essential in order to ensure easy retrieval of information. Referencing is the name given to the method of showing and acknowledging the sources from which the author has obtained ideas or information.

Everything deep is also simple and can be reproduced simply as long as its reference to the whole truth is maintained. But what matters is not what is witty but what is true. Albert Schweitzer (1875–1965)

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Thomas, C.G. (2021). References: How to Cite and List Correctly. In: Research Methodology and Scientific Writing . Springer, Cham. https://doi.org/10.1007/978-3-030-64865-7_15

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5 Accessing Scientific Literature and Referencing

An essential skill for all scientists to master is the ability to access relevant and reliable scientific information from a variety of sources.

You will need access to scientific literature for a variety of reasons:

• designing an experiment
• writing an article or essay
• designing a poster.

All of these tasks involved sourcing reliable, authoritative literature, and you’ll need to know how to reference it.

This chapter will provide student scientists with assistance in navigating the many avenues for locating scientific literature and referencing it, including using the reference management software EndNote.

5.1 Types of scientific literature

The two main types of scientific literature are original investigations and literature reviews.

Original investigations ( Figure 5.1 ) are published accounts of new studies undertaken on a particular topic. They will generally step the reader through the stages of the study:

• introduction

Published literature reviews ( Figure 5.2 ) present a synthesis and evaluation of the existing literature on a particular topic with the aim of gaining a new, deeper understanding of the topic. The review article will be structured around themes rather than stages of the scientific method.

5.2 Accessing scientific literature

You can locate scientific literature via Google Scholar , online databases such as PubMed, and the University of Southern Queensland library website when you are looking for a specific article or searching for literature on a specific topic.

Google Scholar

Google Scholar provides a simple way to perform a broad search for scholarly literature. From one place, you can search across many disciplines and sources:

• court opinions.

Academic publishers, professional societies, online repositories, universities and other web sites all publish these types of literature. Google Scholar helps you find relevant work across the world of scholarly research.

Box 5.1: Search tips

• Set your preferences to retrieve your university library resources: For example, select Settings > Library Link > add University of Southern Queensland Library > Save
• Use the asterisk * (e.g. child* will find child, children, childhood, childless)
• Use the asterisk as a placeholder to find a word within words e.g. “acquired * injury” finds acquired brain injury
• Use quotes to search by phrase (e.g. “type 2 diabetes” or “social media”)

Try this search in Google Scholar: “patient information” AND “back pain”

Extra help with using Google scholar is at this webpage. 

Databases, what are they and how do I use them to find information?

Databases are another way to find quality academic and scholarly information. The USQ library subscribes to many databases that are relevant to your studies in human physiology, such as:

• Web of Science
• ClinicalKey
• ScienceDirect

PubMed is a database that comprises of more than 26 million citations for biomedical literature from MEDLINE, life science journals and online books. Citations may include links to full-text content from PubMed Central and publisher websites.

Journals contain scholarly articles written by experts in specific disciplines. This tutorial explains what scholarly journals are and how to access them from the USQ library.

5.3 Determining if an article is scholarly or peer reviewed

It can be hard to work out if a journal is scholarly or peer reviewed. There is a lot of information online that looks like proper science, but isn’t! These tips can help you determine if you are accessing reliable information.

If searching in a library database:

• Check to see if there is a box on the database search page that allows you to limit your search results to refereed or peer-reviewed journal articles.

If you already have a journal article or title, use these option to check if it is scholarly or peer reviewed: 

• Look at the article itself for a header or similar that indicates refereed or reviewed.
• Look at the table of contents of the journal. Often items are grouped under a heading like ‘reviewed articles’.
• Check the journal’s website to see if a statement is made about the content being peer reviewed or refereed. However, be aware that not all the contents of a refereed journal will be refereed (e.g. books reviews, practice, commentaries, editorials are not peer reviewed).
• Look for the Ulrichsweb database in your library catalogue. If you have access, use the ‘Quick Search’ drop down and select ‘Title (keyword)’ and type in the journal title. Next to journal titles that include at least some refereed content is the image of a black and white striped  ‘referee’s shirt’.  You can also click on the journal title and you will see ‘Refereed – yes or no’.

5.4 Library website resources to assist with searching for authoritative information

Your university library will provide tutorials and resources to help you search for authoritative information.

5.5 Referencing

Anyone who reads your work will need to know where you got your information from if you didn’t generate it yourself (e.g. the results of your experiment). The reference section provides a list of the references that you cited in the body of your work, whether it be a literature review, original investigation research article or essay.

It is important to accurately cite references in research papers to acknowledge your sources and ensure credit is appropriately given to authors of work you have referred to. An accurate and comprehensive reference list also shows your readers that you are well-read in your topic area and are aware of the key papers that provide the context to your research.

It is important to keep track of your resources and to reference them consistently in the format required by the publication in which your work will appear. Most scientists will use referencing software to store details of all of the journal articles (and other sources) they use while writing their review article. This software also automates the process of adding in-text references and creating a reference list.

In-text citations indicate where (within your sentences) you have used the ideas of other scientists. The in-text citations will either be provided as a number, or as the name of the author and date of publication. A reference list is a list of all the sources that you have used as in-text references in your scientific paper that enables the reader of your work to locate and verify the sources you have use.

Here are two basic formats for a reference list:

• an alphabetical listing by first author’s last name (author–date system)
• a numerical listing that reflects the order of the citations in the body of the paper (number format).

The format will depend on the journal of publication, as each journal has their own specific referencing format.

A bibliography tends to use the author–date format, as the works might not be cited in the text.

Author–date system

Author-date reference styles indicate in-text citations by placing the author’s surname and the date of publication in brackets, and the reference list is in alphabetical order by author’s surname. Harvard and APA are examples of author date styles.

The associated images show a section of the discussion, and a section of the reference list of a research article (Bain et al., 2014) that has used an author-date system.

Your university library will provide guidance and examples of the referencing styles you are expected to use. Ask your tutor which style you are to use for your assignment.

This short video shows you the basics of Harvard referencing. Please note there are different interpretations of the style and use the resources provided by your university library when composing your own in-text citations and reference lists.

Click the drop down below to review the terms learned from this chapter.

Bain, A.R., Morrison, S.A., & Ainslie, P.N. (2014). Cerebral oxygenation and hyperthermia. Frontiers in Physiology, 5 , 92.

How To Do Science Copyright © 2022 by University of Southern Queensland is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License , except where otherwise noted.

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General rules for citing sources in scientific writing

Return to main EEB 2245W page

General Guidelines

When to cite: All ideas and facts that are obtained from other sources must be properly cited, unless they qualify as common knowledge. (If in doubt about whether something is common knowledge, provide a citation).

How to cite: If the author’s name is used as part of the sentence, the citation should be in the form "Holsinger (1995) argues that X" If the author’s name is not used in the sentence, then the citation should be in the form "(Holsinger 1995; Jockusch and Simon 1997; Caira et al. 1998)". If there are one or two authors, list their names in the citation. If there are more than two authors, list the first author followed by et al. rather than listing all of the authors in citations. In the literature cited section, all authors must be listed. Refer to the example by Prof. Schwenk below for general guidelines.

Where to cite: The citation should be placed at the end of the sentence (before the punctuation) if it applies to the entire sentence or immediately following the information to which it applies. If several consecutive sentences contain information from the same source, the source may be cited at the end of the last sentence.

Synthesize citations: In your writing aim for synthesis. A single sentence can and should express an idea promoted by several authors; cite all relevant authors at the end of such sentences. Avoid whole paragraphs devoted to the ideas of a single author.

Formatting Guidelines

We will be following the citation format used by the journal Evolution for this course. Here is some information on how to format citations modified from their website.

• A one-to-one correspondence must exist between works cited in the text and those in the Literature Cited section.
• Literature is cited in the text by the last name of the author or authors and the date of publication. For works with three or more authors, the last name of the senior author is followed by "et al." in the text. The complete list of authors is included in the Literature Cited section.
• Use semicolons to separate multiple citations by different authors; use commas to separate multiple citations by the same author (e.g., Jones 1991, 1992; Brown 1993). Note that in-text references are placed in chronological order.
• Do not use commas to separate the author names and dates in in-text citations.
• References in the Literature Cited section should be arranged alphabetically.

Example of Proper Citation Formats

This example shows proper citation format in both the text and literature cited sections. Faculty appearance and faculty quality: Is there a connection?

Kurt Schwenk Dept. of Ecology & Evolutionary Biology U. CT, Storrs, CT 06269 It has been suggested that balding, blond, bearded professors are superior in overall quality (Schwenk 1987), although a few investigators disagree (e.g. Hirsute 1990; Brunette 1991). Indeed, the computer simulation models of Schwenk and Budlite (1990) predict that the addition of a slight beer-belly to the Schwenk (1987) physical parameters would so enhance the popularity of a UConn professor that it is unlikely any space on campus could accommodate his or her class enrollments (with the possible exception of Gample Pavilion). However, in a pointed rebuttal to Schwenk and Budlite (1990), Slender et al. (1991) noted that Professor Schwenk, himself, fits the Schwenk (1987) and Schwenk and Budlite (1990) profile, and his enrollments hardly fulfill the prediction. Furthermore, in her now classic study, La Mujer (1978) showed that female instructors are consistently preferred three to one over males by students at ten top-ranking U.S. institutions. Given that female instructors generally have all their hair, often are not blond, are rarely bearded (Darwin 1871) and only infrequently have beer bellies, these results would seem to falsify the Schwenk (1987) and Schwenk and Budlite (1990) hypotheses. Slender et al. (1991) noted that Schwenk's papers fail to cite the La Mujer study, and they further implied that the quality of Schwenk's scholarship is in question (indeed, they seemed to suggest that Schwenk had faked his data). In a vicious rejoinder to Slender et al. (1991), Schwenk (1992) claimed that Slender, Gracile and Lithe were involved in a massive conspiracy to ruin his professional reputation and that the conspiracy extended to La Mujer, Brunette, Hirsute, and a host of other investigators. He further claimed to have unpublished evidence linking these scientists to a heretofore unrevealed CIA plot to bring Elvis and Marilyn back to life in order to discredit Schwenk and his ideas. As proof, Schwenk (1992) offered the testimony of voices he hears constantly in his head (K. Schwenk, pers. comm.).

Literature Cited

Darwin, C. 1871. The Descent of Man, and Selection in Relation to Sex. Modern Library, New York, NY. [ This is the proper format for a book. ]

Hirsute, G. E. 1990. Hair to stay: beards in the classroom and student preference. J. Taxpayer Waste 254:1086-1089. doi: 10.1002/jez.725

La Mujer, W. 1978. Gender issues in faculty quality. Pp. 150-172 in F. M. Nist and C. Pig, eds. Gonads: Inside or Out? Fullcourt Press, New York, NY. [ This is the proper format for a paper within an edited book. ]

Schwenk, K. 1987. Faculty quality in relation to certain physical parameters. Zeitschrift f*r Schleimhauten und Zungenspitzen 52:231-242. doi: 10.1073/pnas.131203598

Schwenk, K. 1992. Voices in my head: the CIA, Elvis, Marilyn and the plot against me. Xenophobe 11:1-346. doi: 10.1093/icb/icp034

Schwenk, K., and I. P. Budlite. 1990. Excessive beer consumption improves faculty instruction. Bull. Amer. Beer Inst. 21:24-32. doi: 10.1126/science.263.5153.1573

Slender, P., M. W. Gracile, and D. Lithe. 1991. Failure of physical parameter models to predict student preference. Pseudoscientifica 342:233-236. doi: 10.1016/S0169-5347(00)88953-3 [ Return to main EEB 2245W page

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General Hints

The Literature Cited section (bibliography) is found at the end of your paper and contains the complete reference for each of the in-text citations used in your paper. Generally, a citation includes the author(s), date, title and source of your publication.

• The entries in the Literature Cited section should be in one alphabetical listing by author
• Within each entry, list the authors in the order that they appear in the article you read
• Include as many initials for each author as you find on the first page of the article
• All words in the journal title should be spelled out completely
• Only capitalize the first word in the article title as well as proper names
• Type the title exactly as you see it in the journal article
• Do not include any informtion about the database that you used to access the article.
• If the journal is only available online and has no print eqivalent, include a DOI number
• If there are beween 2 and 12 authors, include all
• Italicize species names

Change Up: From Article to Lit Cited

Look at the image below to see how a citation is created from an article.

• << Previous: In-text Citations
• Next: Journal Article >>
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Writing a scientific paper.

• Writing a lab report

What is a "good" introduction?

Citing sources in the introduction, "introduction checklist" from: how to write a good scientific paper. chris a. mack. spie. 2018..

• LITERATURE CITED
• Bibliography of guides to scientific writing and presenting
• Peer Review
• Presentations
• Lab Report Writing Guides on the Web

This is where you describe briefly and clearly why you are writing the paper. The introduction supplies sufficient background information for the reader to understand and evaluate the experiment you did. It also supplies a rationale for the study.

• Present the problem and the proposed solution
• Presents nature and scope of the problem investigated
• Reviews the pertinent literature to orient the reader
• States the method of the experiment
• State the principle results of the experiment

It is important to cite sources in the introduction section of your paper as evidence of the claims you are making. There are ways of citing sources in the text so that the reader can find the full reference in the literature cited section at the end of the paper, yet the flow of the reading is not badly interrupted. Below are some example of how this can be done:     "Smith (1983) found that N-fixing plants could be infected by several different species of Rhizobium."     "Walnut trees are known to be allelopathic (Smith 1949,  Bond et al. 1955, Jones and Green 1963)."     "Although the presence of Rhizobium normally increases the growth of legumes (Nguyen 1987), the opposite effect has been observed (Washington 1999)." Note that articles by one or two authors are always cited in the text using their last names. However, if there are more than two authors, the last name of the 1st author is given followed by the abbreviation et al. which is Latin for "and others". 

From:  https://writingcenter.gmu.edu/guides/imrad-reports-introductions

• Indicate the field of the work, why this field is important, and what has already been done (with proper citations).
• Indicate a gap, raise a research question, or challenge prior work in this territory.
• Outline the purpose and announce the present research, clearly indicating what is novel and why it is significant.
• Avoid: repeating the abstract; providing unnecessary background information; exaggerating the importance of the work; claiming novelty without a proper literature search. 
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REVIEW article

This article is part of the research topic.

Pathogen-Induced Immunosenescence: Where do Vaccines Stand?

TB and HIV Induced Immunosenescence: Where do vaccines play a role? Provisionally Accepted

• 1 Western University of Health Sciences, United States
• 2 Chamberlain University, United States

The final, formatted version of the article will be published soon.

This paper tackles the complex interplay between Human Immunodeficiency virus (HIV-1) and Mycobacterium tuberculosis (M. tuberculosis) infections, particularly their contribution to immunosenescence, the age-related decline in immune function. Using the current literature, we discuss the immunological mechanisms behind TB and HIV-induced immunosenescence and critically evaluate the BCG (Bacillus Calmette-Guérin) vaccine's role. Both HIV-1 and M. tuberculosis demonstrably accelerate immunosenescence: M. tuberculosis through DNA modification and heightened inflammation, and HIV-1 through chronic immune activation and T cell production compromise. HIV-1 and M. tuberculosis co-infection further hastens immunosenescence by affecting T cell differentiation, underscoring the need for prevention and treatment. Furthermore, the use of the BCG tuberculosis vaccine is contraindicated in patients who are HIV positive and there is a lack of investigation regarding the use of this vaccine in patients who develop HIV co-infection with possible immunosenescence. As HIV does not currently have a vaccine, we focus our review more so on the BCG vaccine response as a result of immunosenescence. We found that there are overall limitations with the BCG vaccine, one of which is that it cannot necessarily prevent reoccurance of infection due to effects of immunosenescence or protect the elderly due to this reason. Overall, there is conflicting evidence to show the vaccine's usage due to factors involving its production and administration. Further research into developing a vaccine for HIV and improving the BCG vaccine is warranted to expand scientific understanding for public health and beyond.

Keywords: immunosenescence, M. tuberculosis, Vaccine3, BCG, HIV

Received: 14 Feb 2024; Accepted: 13 May 2024.

Copyright: © 2024 Singh, Patel, Seo, Ahn, Shen, Nakka, Kishore and Venketaraman. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) . The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Mx. Vishwanath Venketaraman, Western University of Health Sciences, Pomona, 91766-1854, California, United States

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Ten Simple Rules for Writing a Literature Review

Marco pautasso.

1 Centre for Functional and Evolutionary Ecology (CEFE), CNRS, Montpellier, France

2 Centre for Biodiversity Synthesis and Analysis (CESAB), FRB, Aix-en-Provence, France

Literature reviews are in great demand in most scientific fields. Their need stems from the ever-increasing output of scientific publications [1] . For example, compared to 1991, in 2008 three, eight, and forty times more papers were indexed in Web of Science on malaria, obesity, and biodiversity, respectively [2] . Given such mountains of papers, scientists cannot be expected to examine in detail every single new paper relevant to their interests [3] . Thus, it is both advantageous and necessary to rely on regular summaries of the recent literature. Although recognition for scientists mainly comes from primary research, timely literature reviews can lead to new synthetic insights and are often widely read [4] . For such summaries to be useful, however, they need to be compiled in a professional way [5] .

When starting from scratch, reviewing the literature can require a titanic amount of work. That is why researchers who have spent their career working on a certain research issue are in a perfect position to review that literature. Some graduate schools are now offering courses in reviewing the literature, given that most research students start their project by producing an overview of what has already been done on their research issue [6] . However, it is likely that most scientists have not thought in detail about how to approach and carry out a literature review.

Reviewing the literature requires the ability to juggle multiple tasks, from finding and evaluating relevant material to synthesising information from various sources, from critical thinking to paraphrasing, evaluating, and citation skills [7] . In this contribution, I share ten simple rules I learned working on about 25 literature reviews as a PhD and postdoctoral student. Ideas and insights also come from discussions with coauthors and colleagues, as well as feedback from reviewers and editors.

Rule 1: Define a Topic and Audience

How to choose which topic to review? There are so many issues in contemporary science that you could spend a lifetime of attending conferences and reading the literature just pondering what to review. On the one hand, if you take several years to choose, several other people may have had the same idea in the meantime. On the other hand, only a well-considered topic is likely to lead to a brilliant literature review [8] . The topic must at least be:

• interesting to you (ideally, you should have come across a series of recent papers related to your line of work that call for a critical summary),
• an important aspect of the field (so that many readers will be interested in the review and there will be enough material to write it), and
• a well-defined issue (otherwise you could potentially include thousands of publications, which would make the review unhelpful).

Ideas for potential reviews may come from papers providing lists of key research questions to be answered [9] , but also from serendipitous moments during desultory reading and discussions. In addition to choosing your topic, you should also select a target audience. In many cases, the topic (e.g., web services in computational biology) will automatically define an audience (e.g., computational biologists), but that same topic may also be of interest to neighbouring fields (e.g., computer science, biology, etc.).

Rule 2: Search and Re-search the Literature

After having chosen your topic and audience, start by checking the literature and downloading relevant papers. Five pieces of advice here:

• keep track of the search items you use (so that your search can be replicated [10] ),
• keep a list of papers whose pdfs you cannot access immediately (so as to retrieve them later with alternative strategies),
• use a paper management system (e.g., Mendeley, Papers, Qiqqa, Sente),
• define early in the process some criteria for exclusion of irrelevant papers (these criteria can then be described in the review to help define its scope), and
• do not just look for research papers in the area you wish to review, but also seek previous reviews.

The chances are high that someone will already have published a literature review ( Figure 1 ), if not exactly on the issue you are planning to tackle, at least on a related topic. If there are already a few or several reviews of the literature on your issue, my advice is not to give up, but to carry on with your own literature review,

The bottom-right situation (many literature reviews but few research papers) is not just a theoretical situation; it applies, for example, to the study of the impacts of climate change on plant diseases, where there appear to be more literature reviews than research studies [33] .

• discussing in your review the approaches, limitations, and conclusions of past reviews,
• trying to find a new angle that has not been covered adequately in the previous reviews, and
• incorporating new material that has inevitably accumulated since their appearance.

When searching the literature for pertinent papers and reviews, the usual rules apply:

• be thorough,
• use different keywords and database sources (e.g., DBLP, Google Scholar, ISI Proceedings, JSTOR Search, Medline, Scopus, Web of Science), and
• look at who has cited past relevant papers and book chapters.

Rule 3: Take Notes While Reading

If you read the papers first, and only afterwards start writing the review, you will need a very good memory to remember who wrote what, and what your impressions and associations were while reading each single paper. My advice is, while reading, to start writing down interesting pieces of information, insights about how to organize the review, and thoughts on what to write. This way, by the time you have read the literature you selected, you will already have a rough draft of the review.

Of course, this draft will still need much rewriting, restructuring, and rethinking to obtain a text with a coherent argument [11] , but you will have avoided the danger posed by staring at a blank document. Be careful when taking notes to use quotation marks if you are provisionally copying verbatim from the literature. It is advisable then to reformulate such quotes with your own words in the final draft. It is important to be careful in noting the references already at this stage, so as to avoid misattributions. Using referencing software from the very beginning of your endeavour will save you time.

Rule 4: Choose the Type of Review You Wish to Write

After having taken notes while reading the literature, you will have a rough idea of the amount of material available for the review. This is probably a good time to decide whether to go for a mini- or a full review. Some journals are now favouring the publication of rather short reviews focusing on the last few years, with a limit on the number of words and citations. A mini-review is not necessarily a minor review: it may well attract more attention from busy readers, although it will inevitably simplify some issues and leave out some relevant material due to space limitations. A full review will have the advantage of more freedom to cover in detail the complexities of a particular scientific development, but may then be left in the pile of the very important papers “to be read” by readers with little time to spare for major monographs.

There is probably a continuum between mini- and full reviews. The same point applies to the dichotomy of descriptive vs. integrative reviews. While descriptive reviews focus on the methodology, findings, and interpretation of each reviewed study, integrative reviews attempt to find common ideas and concepts from the reviewed material [12] . A similar distinction exists between narrative and systematic reviews: while narrative reviews are qualitative, systematic reviews attempt to test a hypothesis based on the published evidence, which is gathered using a predefined protocol to reduce bias [13] , [14] . When systematic reviews analyse quantitative results in a quantitative way, they become meta-analyses. The choice between different review types will have to be made on a case-by-case basis, depending not just on the nature of the material found and the preferences of the target journal(s), but also on the time available to write the review and the number of coauthors [15] .

Rule 5: Keep the Review Focused, but Make It of Broad Interest

Whether your plan is to write a mini- or a full review, it is good advice to keep it focused 16 , 17 . Including material just for the sake of it can easily lead to reviews that are trying to do too many things at once. The need to keep a review focused can be problematic for interdisciplinary reviews, where the aim is to bridge the gap between fields [18] . If you are writing a review on, for example, how epidemiological approaches are used in modelling the spread of ideas, you may be inclined to include material from both parent fields, epidemiology and the study of cultural diffusion. This may be necessary to some extent, but in this case a focused review would only deal in detail with those studies at the interface between epidemiology and the spread of ideas.

While focus is an important feature of a successful review, this requirement has to be balanced with the need to make the review relevant to a broad audience. This square may be circled by discussing the wider implications of the reviewed topic for other disciplines.

Rule 6: Be Critical and Consistent

Reviewing the literature is not stamp collecting. A good review does not just summarize the literature, but discusses it critically, identifies methodological problems, and points out research gaps [19] . After having read a review of the literature, a reader should have a rough idea of:

• the major achievements in the reviewed field,
• the main areas of debate, and
• the outstanding research questions.

It is challenging to achieve a successful review on all these fronts. A solution can be to involve a set of complementary coauthors: some people are excellent at mapping what has been achieved, some others are very good at identifying dark clouds on the horizon, and some have instead a knack at predicting where solutions are going to come from. If your journal club has exactly this sort of team, then you should definitely write a review of the literature! In addition to critical thinking, a literature review needs consistency, for example in the choice of passive vs. active voice and present vs. past tense.

Rule 7: Find a Logical Structure

Like a well-baked cake, a good review has a number of telling features: it is worth the reader's time, timely, systematic, well written, focused, and critical. It also needs a good structure. With reviews, the usual subdivision of research papers into introduction, methods, results, and discussion does not work or is rarely used. However, a general introduction of the context and, toward the end, a recapitulation of the main points covered and take-home messages make sense also in the case of reviews. For systematic reviews, there is a trend towards including information about how the literature was searched (database, keywords, time limits) [20] .

How can you organize the flow of the main body of the review so that the reader will be drawn into and guided through it? It is generally helpful to draw a conceptual scheme of the review, e.g., with mind-mapping techniques. Such diagrams can help recognize a logical way to order and link the various sections of a review [21] . This is the case not just at the writing stage, but also for readers if the diagram is included in the review as a figure. A careful selection of diagrams and figures relevant to the reviewed topic can be very helpful to structure the text too [22] .

Rule 8: Make Use of Feedback

Reviews of the literature are normally peer-reviewed in the same way as research papers, and rightly so [23] . As a rule, incorporating feedback from reviewers greatly helps improve a review draft. Having read the review with a fresh mind, reviewers may spot inaccuracies, inconsistencies, and ambiguities that had not been noticed by the writers due to rereading the typescript too many times. It is however advisable to reread the draft one more time before submission, as a last-minute correction of typos, leaps, and muddled sentences may enable the reviewers to focus on providing advice on the content rather than the form.

Feedback is vital to writing a good review, and should be sought from a variety of colleagues, so as to obtain a diversity of views on the draft. This may lead in some cases to conflicting views on the merits of the paper, and on how to improve it, but such a situation is better than the absence of feedback. A diversity of feedback perspectives on a literature review can help identify where the consensus view stands in the landscape of the current scientific understanding of an issue [24] .

Rule 9: Include Your Own Relevant Research, but Be Objective

In many cases, reviewers of the literature will have published studies relevant to the review they are writing. This could create a conflict of interest: how can reviewers report objectively on their own work [25] ? Some scientists may be overly enthusiastic about what they have published, and thus risk giving too much importance to their own findings in the review. However, bias could also occur in the other direction: some scientists may be unduly dismissive of their own achievements, so that they will tend to downplay their contribution (if any) to a field when reviewing it.

In general, a review of the literature should neither be a public relations brochure nor an exercise in competitive self-denial. If a reviewer is up to the job of producing a well-organized and methodical review, which flows well and provides a service to the readership, then it should be possible to be objective in reviewing one's own relevant findings. In reviews written by multiple authors, this may be achieved by assigning the review of the results of a coauthor to different coauthors.

Rule 10: Be Up-to-Date, but Do Not Forget Older Studies

Given the progressive acceleration in the publication of scientific papers, today's reviews of the literature need awareness not just of the overall direction and achievements of a field of inquiry, but also of the latest studies, so as not to become out-of-date before they have been published. Ideally, a literature review should not identify as a major research gap an issue that has just been addressed in a series of papers in press (the same applies, of course, to older, overlooked studies (“sleeping beauties” [26] )). This implies that literature reviewers would do well to keep an eye on electronic lists of papers in press, given that it can take months before these appear in scientific databases. Some reviews declare that they have scanned the literature up to a certain point in time, but given that peer review can be a rather lengthy process, a full search for newly appeared literature at the revision stage may be worthwhile. Assessing the contribution of papers that have just appeared is particularly challenging, because there is little perspective with which to gauge their significance and impact on further research and society.

Inevitably, new papers on the reviewed topic (including independently written literature reviews) will appear from all quarters after the review has been published, so that there may soon be the need for an updated review. But this is the nature of science [27] – [32] . I wish everybody good luck with writing a review of the literature.

Acknowledgments

Many thanks to M. Barbosa, K. Dehnen-Schmutz, T. Döring, D. Fontaneto, M. Garbelotto, O. Holdenrieder, M. Jeger, D. Lonsdale, A. MacLeod, P. Mills, M. Moslonka-Lefebvre, G. Stancanelli, P. Weisberg, and X. Xu for insights and discussions, and to P. Bourne, T. Matoni, and D. Smith for helpful comments on a previous draft.

Funding Statement

This work was funded by the French Foundation for Research on Biodiversity (FRB) through its Centre for Synthesis and Analysis of Biodiversity data (CESAB), as part of the NETSEED research project. The funders had no role in the preparation of the manuscript.

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Title: dollm: how large language models understanding network flow data to detect carpet bombing ddos.

Abstract: It is an interesting question Can and How Large Language Models (LLMs) understand non-language network data, and help us detect unknown malicious flows. This paper takes Carpet Bombing as a case study and shows how to exploit LLMs' powerful capability in the networking area. Carpet Bombing is a new DDoS attack that has dramatically increased in recent years, significantly threatening network infrastructures. It targets multiple victim IPs within subnets, causing congestion on access links and disrupting network services for a vast number of users. Characterized by low-rates, multi-vectors, these attacks challenge traditional DDoS defenses. We propose DoLLM, a DDoS detection model utilizes open-source LLMs as backbone. By reorganizing non-contextual network flows into Flow-Sequences and projecting them into LLMs semantic space as token embeddings, DoLLM leverages LLMs' contextual understanding to extract flow representations in overall network context. The representations are used to improve the DDoS detection performance. We evaluate DoLLM with public datasets CIC-DDoS2019 and real NetFlow trace from Top-3 countrywide ISP. The tests have proven that DoLLM possesses strong detection capabilities. Its F1 score increased by up to 33.3% in zero-shot scenarios and by at least 20.6% in real ISP traces.

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