Research & Publishing Guide | Updated August 2026
Correct referencing is a core requirement in academic writing. Whether you are preparing a journal article, undergraduate project, master's dissertation, PhD thesis, conference paper or research report, your sources must be acknowledged clearly and consistently.
There is no single referencing style used by every university or journal. Different academic disciplines rely on different citation systems, and individual journals may also modify standard styles to suit their own publication requirements.
The most widely used styles include APA, MLA, Chicago, Harvard, Vancouver and IEEE.
What Is a Referencing Style?
A referencing style is a set of rules for showing where information, ideas, data and quotations came from.
It normally determines how citations appear inside the text and how complete source details are presented at the end of the document.
- Author names
- Publication year
- Article or book title
- Journal title
- Volume and issue
- Page numbers
- DOI
- URL
Why Referencing Matters
Referencing helps readers verify claims, locate original sources and distinguish the researcher's own contribution from previous scholarship.
It also supports academic integrity by reducing the risk of plagiarism and improper attribution.
APA 7th Edition
APA is widely used in psychology, education, social sciences, behavioural sciences, business and some health-related disciplines.
APA uses an author-date system.
APA In-Text Citation
Parenthetical example: (John, 2025)
Narrative example: John (2025) reported that computational techniques improved the analysis.
Two authors: (John & Lawson, 2025)
Three or more authors: (John et al., 2025)
APA Journal Reference Example
John, M. N., & Lawson, T. W. J. (2025). Computational methods for algebraic structures. Journal of Mathematical Research, 12(3), 101–118. https://doi.org/10.xxxx/xxxxx
MLA 9th Edition
MLA is commonly used in literature, languages, cultural studies and other humanities disciplines.
MLA normally uses an author-page citation system.
MLA In-Text Citation
(John 45)
If the author's name already appears in the sentence, only the page number may be required.
MLA Works Cited Example
John, Michael N. “Computational Methods for Algebraic Structures.” Journal of Mathematical Research, vol. 12, no. 3, 2025, pp. 101–118.
Chicago Style
Chicago is widely used in history, humanities, publishing and some social-science disciplines.
It provides two major systems.
Chicago Notes and Bibliography
This system uses footnotes or endnotes together with a bibliography.
Example footnote: Michael N. John, Computational Algebra and Its Applications (Academic Press, 2025), 45.
Chicago Author-Date
Example: (John 2025, 45)
Harvard Referencing
Harvard is another widely used author-date system.
Unlike APA, there is no single universal Harvard manual. Universities and publishers often use their own variations.
Harvard In-Text Citation
(John, 2025)
For a specific page: (John, 2025, p. 45)
Harvard Reference Example
John, M.N. and Lawson, T.W.J. (2025) ‘Computational methods for algebraic structures’, Journal of Mathematical Research, 12(3), pp. 101–118.
Vancouver Referencing Style
Vancouver is widely used in medicine, nursing, biomedical sciences, public health and clinical research.
It is a numbered referencing system.
Vancouver In-Text Citation
Recent studies have demonstrated the importance of computational modelling in biomedical research (1).
Vancouver Reference Example
1. John MN, Lawson TWJ. Computational methods for algebraic structures. J Math Res. 2025;12(3):101-118.
IEEE Referencing Style
IEEE is commonly used in engineering, computer science, electronics, telecommunications, artificial intelligence and related technical disciplines.
IEEE also uses numbered references.
IEEE In-Text Citation
Computational techniques have been widely applied to optimisation problems [1].
IEEE Reference Example
[1] M. N. John and T. W. J. Lawson, “Computational methods for algebraic structures,” Journal of Mathematical Research, vol. 12, no. 3, pp. 101–118, 2025.
Major Referencing Styles Compared
- APA: author-date system, common in social sciences and education.
- MLA: author-page system, common in humanities.
- Chicago: notes-and-bibliography or author-date.
- Harvard: author-date system with institutional variations.
- Vancouver: numbered system widely used in medicine.
- IEEE: numbered system widely used in engineering and computing.
Which Referencing Style Should You Use?
The correct style is usually determined by your university, department, supervisor, journal or publisher.
If you are preparing a journal article, always read the journal's current Instructions for Authors before formatting the manuscript.
Do not assume that a journal requires APA simply because your discipline commonly uses APA.
How to Reference Journal Articles Correctly
A journal reference usually requires:
- Author or authors
- Publication year
- Article title
- Journal title
- Volume
- Issue
- Page range or article number
- DOI where available
Always verify the bibliographic details against the original journal or publisher record.
How to Use DOI Information
A DOI is a persistent identifier assigned to many scholarly publications.
When a DOI is available and required by the chosen style, include it accurately.
Never invent or guess a DOI.
Referencing Websites
A web reference may require:
- Author or organisation
- Date
- Page title
- Website name
- URL
- Access date where required
Whenever possible, cite the original source rather than a website that merely repeats information from another publication.
Referencing Research Data
Datasets are increasingly treated as scholarly outputs and should be cited when they contribute directly to a study.
A dataset reference may include the creator, year, title, version, repository and DOI or other persistent identifier.
Referencing Preprints
Preprints may be cited when relevant, but they should be clearly identified as preprints.
Researchers should not present a preprint as though it has already passed peer review.
Referencing Retracted Research
Before submitting a manuscript, researchers should check whether important cited articles have been retracted or corrected.
A retracted paper should not normally be used as reliable evidence unless the retraction itself is relevant to the discussion.
AI-Generated References Require Verification
Generative AI tools can produce references that appear genuine but contain incorrect information or refer to publications that do not exist.
Every AI-suggested citation should therefore be checked independently.
Verify:
- Author names
- Article title
- Journal name
- Publication year
- Volume and issue
- Pages or article number
- DOI
Common Referencing Mistakes
- Using several styles in the same manuscript
- Incorrect author names
- Incorrect publication years
- Missing in-text citations
- References listed but never cited
- Fabricated references
- Incorrect DOIs
- Citing secondary sources when the original source is available
- Failing to identify preprints
- Citing retracted research without explanation
Reference List and Bibliography: Are They the Same?
Not always.
A reference list generally contains only works actually cited in the document.
A bibliography may include cited works as well as other materials consulted during the research.
Alphabetical or Numbered References?
The order depends on the referencing system.
- APA: usually alphabetical.
- Harvard: usually alphabetical.
- MLA: usually alphabetical.
- Vancouver: numerical order of first citation.
- IEEE: numerical order of first citation.
- Chicago: depends on the selected Chicago system.
Reference Management Software
Reference managers can save significant time, especially when handling large numbers of sources.
Popular tools include:
- Zotero
- Mendeley
- EndNote
- JabRef
- Paperpile
These programs can insert citations and generate reference lists, but their output should still be checked for errors.
Can You Change From APA to Vancouver or IEEE?
Yes.
Reference-management software can often convert an entire manuscript from one citation style to another.
For example, an APA citation such as (John, 2025) may become (1) in Vancouver or [1] in IEEE.
Do Scopus Journals Require One Particular Referencing Style?
No single referencing style is required simply because a journal is indexed in Scopus.
Different Scopus-indexed journals use APA, Vancouver, Harvard, IEEE, Chicago and many publisher-specific formats.
Authors should follow the instructions of the target journal.
Which Referencing Style Is Best?
There is no universally best referencing style.
The best choice is the one required for your particular manuscript.
- APA: psychology, education and social sciences
- MLA: literature, languages and humanities
- Chicago: history and scholarly publishing
- Harvard: multidisciplinary academic writing
- Vancouver: medicine and health sciences
- IEEE: engineering, computing and technology
Final Referencing Checklist
- Confirm the required referencing style.
- Follow the target journal's latest author instructions.
- Check every in-text citation against the reference list.
- Verify author names and publication years.
- Verify journal titles, volume and issue numbers.
- Check page ranges or article numbers.
- Verify every DOI.
- Check URLs where required.
- Identify preprints correctly.
- Check for retractions or corrections.
- Verify AI-suggested references independently.
- Use one consistent style throughout the manuscript.
Conclusion
Referencing is a fundamental part of academic writing and research integrity.
APA, MLA, Chicago, Harvard, Vancouver and IEEE remain among the most commonly used systems, but the correct style depends on your institution, discipline and target journal.
The most important practice is consistency and accuracy.
Researchers should verify every source, follow the current instructions of the journal or institution and avoid relying blindly on automatically generated references.
Accurate referencing improves the credibility of a manuscript, allows readers to verify evidence and connects new research with the wider scholarly literature.