APA vs MLA vs Chicago: Style Guide Comparison

Quick Comparison Table

APA Style (7th Edition)

The American Psychological Association style is used primarily in psychology, education, and other social sciences.

Title Capitalization Rules

• Capitalize words of 4 or more letters
• Capitalize first and last words always
• Capitalize verbs, nouns, adjectives, adverbs (regardless of length)
• Lowercase articles (a, an, the), short prepositions, and conjunctions under 4 letters

Examples

"The Effects of Social Media on Mental Health"
"Understanding Between-Group Differences"
"How to Write With Clarity and Precision"

When to Use APA

• Psychology research papers
• Education and social sciences
• Nursing and medical fields
• Business and economics (sometimes)

Citation Format

APA uses author-date citations in text:

Recent research (Smith, 2024) suggests...
Multiple studies have shown (Jones, 2023; Brown, 2024)...

MLA Style (9th Edition)

The Modern Language Association style is the standard for literature, language arts, and other humanities disciplines.

Title Capitalization Rules

• Capitalize all principal words
• Capitalize first and last words always
• Lowercase articles, coordinating conjunctions, and prepositions (unless first/last)
• No minimum word length rule (unlike APA)

Examples

"The Role of Technology in Modern Education"
"Pride and Prejudice: A Critical Analysis"
"How to Read Literature Like a Professor"

When to Use MLA

• Literature and language studies
• Humanities research
• Cultural studies
• Film and media analysis

Citation Format

MLA uses author-page citations:

Shakespeare's sonnets reveal (Smith 45).
As noted by recent scholars (Jones 123; Brown 67)...

Chicago Style (17th Edition)

The Chicago Manual of Style is used in publishing, history, and many humanities disciplines. It offers two citation systems.

Title Capitalization Rules

• Capitalize all major words (nouns, pronouns, verbs, adjectives, adverbs)
• Capitalize subordinating conjunctions (although, because, since)
• Lowercase articles, coordinating conjunctions, and ALL prepositions (regardless of length)
• Capitalize first word after colon in titles

Examples

"The Rise and Fall of the Third Reich"
"Democracy in America: A Historical Perspective"
"Understanding through Experience: A Practical Guide"

When to Use Chicago

• History papers and books
• Book publishing (most publishers)
• Arts and humanities (alternative to MLA)
• Theology and religious studies

Citation Formats

Chicago offers two systems:

Notes-Bibliography (Most Common)

Footnote/Endnote: 1. Mary Smith, Book Title (City: Publisher, 2024), 45.
Bibliography: Smith, Mary. Book Title. City: Publisher, 2024.

Author-Date (Alternative)

In-text: Recent studies (Smith 2024, 45) show...
Reference list: Smith, Mary. 2024. Book Title. City: Publisher.

Side-by-Side Examples

Example 1: Simple Title

All three are identical for this title

Example 2: With Preposition "With"

APA capitalizes "With" (4 letters), others don't

Example 3: With Longer Preposition

APA capitalizes "Between" (7 letters), others don't

Example 4: With Subtitle

All capitalize after colon

Choosing the Right Style Guide

By Academic Discipline

Decision Flowchart

1. Does your professor specify a style? → Use that one
2. Is your field science/social science? → APA
3. Is your field humanities/literature? → MLA
4. Is your field history/publishing? → Chicago
5. Still unsure? → Check your department's guidelines

Common Mistakes Across All Styles

Mistake #1: Mixing Styles

Don't use APA title case with MLA citations:

❌ "Understanding With Depth" (Jones 45)
✓ Pick one style and stick with it

Mistake #2: Lowercase After Colons

All three styles capitalize after colons:

❌ "Technology: the future of education"
✓ "Technology: The Future of Education"

Mistake #3: Not Checking Updates

• APA 7th Edition (2019) changed from APA 6th
• MLA 9th Edition (2021) updated from MLA 8th
• Chicago 17th Edition (2017) added new digital citation rules