What Is a Citation Style?
A citation style is a standardized system for acknowledging sources in academic writing. It sets rules for how to cite sources in the text and how to list them in a reference list or bibliography, covering details such as the order of information, punctuation, capitalization and formatting. Citation styles help readers to find your sources and show that you have credited others' work.
Main styles and where they are used
| Style | Typical fields | In-text format |
|---|---|---|
| APA | Psychology, education, social sciences, nursing | Author and year |
| MLA | Literature, languages, humanities | Author and page |
| Chicago (notes-bibliography) | History, arts, humanities | Footnotes or endnotes |
| Chicago (author-date) | Sciences and social sciences | Author and year |
| Harvard | Many fields, especially in the UK and Australia | Author and year |
| IEEE | Engineering, computing | Numbers in brackets |
| Vancouver | Medicine and health sciences | Numbers |
| OSCOLA | Law in the UK | Footnotes |
| AMA, ASA and others | Medicine, sociology | Varied |
Each has editions and local variations, so check which version your course uses.
Parts of a style
- In-text citations: short markers in your text that point to a source.
- Reference list or bibliography: the full details of each source, usually at the end.
- Quotation rules: how to quote and format long quotations.
- Formatting guidance: headings, tables, figures and numbers.
- Rules for special sources: websites, social media, data, interviews and AI tools.
Applying a style
- Find out which style and edition to use.
- Collect source details as you research: authors, dates, titles, publishers, pages and identifiers.
- Cite as you write, not afterward.
- Format the reference list according to the style, using a guide or manager.
- Check that every in-text citation matches an entry and the reverse.
- Proofread for punctuation, capitalization and order.
Tools
Reference managers and citation generators can format sources, though they make mistakes. Always check against the style guide. Many universities have library guides with examples.
Why it matters
Using a citation style consistently avoids plagiarism, supports your argument with evidence and lets readers trace your sources. Markers often grade formatting as part of the assessment.
Related terms
See bibliography, works cited, DOI, primary source and peer review.
Frequently asked questions
Which citation style should I use?
The one your instructor or institution requires. If none is specified, use the style that is standard in your field, and stay consistent.
What is the difference between citations and references?
A citation is the short mention in your text, such as an author and year or a number. The reference list or bibliography gives the full details of each source.
Do I need to memorize the rules?
No. Keep the official guide or a reliable summary handy, and use a reference manager to format sources, but check the output.