Citation Styles Compared: APA, MLA, and Chicago

APA, MLA, and Chicago are the three dominant citation systems in English-language academia. Each uses different formatting rules for in-text citations and reference lists — and using the wrong style is one of the most avoidable errors in academic writing.

This guide provides a practical side-by-side comparison to help you apply the correct format for your discipline and assignment requirements.

APA (7th Edition)

The American Psychological Association style dominates social sciences, education, psychology, and nursing. It uses an author-date in-text citation system.

• In-text: (Author, Year) or Author (Year)
• Reference list: Author, A. A. (Year). Title in sentence case. Publisher.
• Example: (Smith, 2024) → Smith, J. (2024). Research methods in practice. Academic Press.
• DOIs formatted as https://doi.org/xxxxx

MLA (9th Edition)

Modern Language Association style is standard in humanities — literature, philosophy, cultural studies, and languages. It uses author-page in-text citations.

• In-text: (Author Page) — no comma, no "p." for prose
• Works Cited: Author. "Title in Quotes." Container, vol., no., Year, pp.
• Example: (Smith 42) → Smith, John. "Narrative Structure in Modern Fiction." Literary Review, vol. 15, no. 2, 2024, pp. 40–58.
• No cover page required; heading on first page only

Chicago (17th Edition)

The Chicago Manual of Style serves history, arts, and some social sciences. It offers two systems: Notes-Bibliography (footnotes) and Author-Date (similar to APA).

• Notes: Superscript number → footnote with full citation → bibliography entry
• Author-Date: (Author Year, Page) in parentheses
• Example footnote: 1. John Smith, Research Methods (New York: Academic Press, 2024), 42.
• Bibliography: Smith, John. Research Methods. New York: Academic Press, 2024.

Master paraphrasing with proper citation

Conclusion

Citation style is not cosmetic — it is how scholarly communities trace ideas to their sources. Consistent, correct formatting demonstrates professionalism and protects you from accidental plagiarism.