What Is the Difference Between MLA and APA Format? A Clear Comparison Guide 2026
MLA and APA are the two most commonly required citation formats in US and UK universities — yet students regularly confuse them, apply the wrong format, or produce a confused hybrid of both. This guide cuts through the confusion with a direct, side-by-side comparison of MLA 9th edition and APA 7th edition, covering when to use each, how in-text citations work, and how to format the reference list for the most common source types.
When to Use APA vs MLA (and When to Use Neither)
The clearest guidance comes from the disciplines themselves:
| Discipline | Typical Citation Style |
|---|---|
| Psychology, Social Sciences | APA 7 |
| Education, Nursing, Public Health | APA 7 |
| Literature, Humanities, Arts | MLA 9 |
| History, Philosophy | Chicago / Turabian |
| Law (UK) | OSCOLA |
| Medicine, Life Sciences | Vancouver / AMA |
| UK universities (many disciplines) | Harvard |
The rule: Always check your department’s or supervisor’s specific requirement. The above is a general pattern, not a universal rule — many social science departments in UK universities use Harvard rather than APA, and many interdisciplinary programmes have their own preferences. See our full guide on what citation style to use for your thesis.
In-Text Citations: APA vs MLA Side-by-Side
| Scenario | APA 7 Format | MLA 9 Format |
|---|---|---|
| Parenthetical (general) | (Smith, 2024) | (Smith 47) |
| Direct quote | (Smith, 2024, p. 47) | (Smith 47) |
| Narrative citation | Smith (2024) argues… | Smith argues… (47) |
| Two authors | (Smith & Jones, 2024) | (Smith and Jones 47) |
| Three or more authors | (Smith et al., 2024) | (Smith et al. 47) |
| No author | (“Title,” 2024) | (“Title” 47) or (Title) |
| Website / no page number | (Smith, 2024) — no page | (Smith) — no page if none |
Key difference: APA uses the year of publication as the key identifier (because in sciences, currency of research matters enormously). MLA uses the page number (because in humanities, the specific location of the text being discussed is what matters).
Reference List vs Works Cited: Key Differences
- APA 7 uses “References” — a list of only the sources you cited in-text, ordered alphabetically by author surname.
- MLA 9 uses “Works Cited” — same principle: only cited works, alphabetically ordered by author’s last name.
Both use a hanging indent. Neither is numbered. The main structural differences:
- APA lists author as: Smith, J. A. (initials only). MLA lists as: Smith, John (full first name).
- APA puts year immediately after author: Smith, J. A. (2024). Book Title. Publisher. MLA puts year at end: Smith, John. Book Title. Publisher, 2024.
- APA uses sentence case for book/article titles. MLA uses Title Case.
- MLA requires “container” information (e.g., the database or platform for digital sources) — APA does not.
Citation Examples for the Most Common Source Types
Journal article:
APA 7: Smith, J. A., & Brown, K. L. (2024). The impact of AI tools on academic writing. Higher Education Research & Development, 43(2), 214–229. https://doi.org/10.xxxx/xxxx
MLA 9: Smith, John A., and Karen L. Brown. “The Impact of AI Tools on Academic Writing.” Higher Education Research & Development, vol. 43, no. 2, 2024, pp. 214–229.
Book:
APA 7: Creswell, J. W. (2022). Research design: Qualitative, quantitative, and mixed methods approaches (5th ed.). Sage.
MLA 9: Creswell, John W. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. 5th ed., Sage, 2022.
Website:
APA 7: UK Research and Innovation. (2025, March 15). Open access policy guidance. https://www.ukri.org/publications/open-access/
MLA 9: UK Research and Innovation. “Open Access Policy Guidance.” UKRI, 15 Mar. 2025, www.ukri.org/publications/open-access/.
For comprehensive APA 7 examples covering 30+ source types, see our APA citation format complete guide. For MLA 9, see the MLA format guide.
Frequently Asked Questions
What is the main difference between MLA and APA format?
The main differences are: (1) in-text citations — APA uses Author-Year (Smith, 2024), MLA uses Author-Page (Smith 47); (2) discipline — APA is standard in social sciences and sciences, MLA in humanities and literature; (3) reference list formatting — APA uses sentence case for titles with year immediately after author, MLA uses Title Case with year at end of entry. Both are alphabetically ordered and use hanging indents.
Do you use APA or MLA for a psychology thesis?
APA (American Psychological Association) format is the standard for psychology — it was developed by the APA specifically for psychology and social science writing. All major psychology journals use APA format, and virtually all psychology departments at UK and US universities require APA for dissertations and theses. Use APA 7th edition (the current edition, published 2019) unless your department specifically requires an older edition.
Does MLA use page numbers in citations?
Yes. MLA in-text citations are based on page numbers — (Smith 47) means page 47 of Smith’s work. If no page number is available (e.g., a website or e-book without page numbers), you cite just the author: (Smith). In contrast, APA does not require page numbers in general citations — only for direct quotes — because APA readers care more about when research was published than where a specific quote appears.
Is Harvard referencing the same as APA?
No. Both are author-date systems and look similar, but they differ in punctuation, title case rules, publisher location requirements, and the treatment of multiple authors. APA is governed by the American Psychological Association with a single definitive manual. Harvard has no governing body and exists in multiple institutional variants (Cite Them Right, Leeds Harvard, Anglia Ruskin Harvard). For a full comparison, see our guide to what is Harvard referencing.
Can I use APA and MLA in the same document?
No — you must use one citation system consistently throughout your thesis or essay. Mixing APA and MLA in the same document is an academic writing error that demonstrates lack of citation literacy. If your thesis spans disciplines (e.g., a creative writing dissertation that includes both literary analysis and psychological research), your department will specify which single system to use — usually the one appropriate for the primary discipline.
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