APA vs MLA vs Harvard vs Chicago: Referencing Styles Compared

Choosing the right referencing style can be confusing — especially when different lecturers require different formats. This guide compares the four most common citation styles side by side so you know exactly what to use and when.

Quick Overview

• APA (7th ed.): Author-date system, most common in psychology, education, social sciences, and nursing
• MLA (9th ed.): Author-page system, used in literature, languages, and humanities
• Harvard: Author-date system (similar to APA), popular in UK and Australian universities across many subjects
• Chicago/Turabian: Two systems — Notes-Bibliography (humanities) and Author-Date (sciences)

In-Text Citation Comparison

APA

Format: (Author, Year) — Example: (Smith, 2024) or Smith (2024) argues that...

MLA

Format: (Author Page) — Example: (Smith 45) or Smith argues that... (45)

Harvard

Format: (Author, Year) — Example: (Smith, 2024) — very similar to APA

Chicago (Notes-Bibliography)

Format: Footnote number¹ — Full citation in footnote at bottom of page

Reference List Comparison (Book)

APA

Smith, J. A. (2024). The art of academic writing. Oxford University Press.

MLA

Smith, John A. The Art of Academic Writing. Oxford University Press, 2024.

Harvard

Smith, J.A. (2024) The art of academic writing. Oxford: Oxford University Press.

Chicago

Smith, John A. The Art of Academic Writing. Oxford: Oxford University Press, 2024.

Which Style for Which Subject?

• APA: Psychology, Education, Nursing, Social Work, Business
• MLA: English Literature, Languages, Cultural Studies, Arts
• Harvard: Common across UK/Australian universities in all subjects
• Chicago: History, Philosophy, Theology, some humanities disciplines

Key Differences at a Glance

• Title capitalization: APA uses sentence case for article titles; MLA and Chicago use title case
• Page numbers: MLA requires page numbers in every in-text citation; APA only for direct quotes
• Reference list name: APA = "References", MLA = "Works Cited", Harvard = "Reference List", Chicago = "Bibliography"
• DOI: APA requires DOI links; other styles vary
• Footnotes: Only Chicago Notes-Bibliography uses footnotes as primary citations

Tips for Getting It Right

• ✅ Always check your assignment brief for the required style
• ✅ Use citation generators (Cite This For Me, EasyBib, Scribbr) to save time
• ✅ Use reference management tools (Zotero, Mendeley) to organise and format automatically
• ✅ Be consistent — never mix referencing styles in one document
• ✅ Check your university's referencing guide — many have their own adapted version of Harvard