How to Cite Multiple Authors in Chicago Style

Many academic works are co-authored by multiple researchers, requiring careful attention to citation format. Chicago style has specific rules for two, three, and four or more authors that differ between the Notes-Bibliography and Author-Date systems. This guide provides clear guidance for citing collaborative works correctly.

Two Authors in Chicago Style

Works with two authors require listing both names in full citations.

Notes-Bibliography with Two Authors

Full note:

1. Author One First Last and Author Two First Last, Title of Work, publication details.

Example:

1. Jennifer Adams and Michael Chen, Modern Research Methods (New York: Academic Press, 2023), 45.

Shortened note:

2. Adams and Chen, Modern Research Methods, 50.

Bibliography:

Adams, Jennifer, and Michael Chen. Modern Research Methods. New York: Academic Press, 2023.

Author-Date with Two Authors

In-text citation:

(Adams and Chen 2023, 45)

Reference list:

Adams, Jennifer, and Michael Chen. 2023. Modern Research Methods. New York: Academic Press.

Three Authors in Chicago Style

With three authors, Chicago style still lists all names in full citations, though shortened forms may vary.

Notes-Bibliography with Three Authors

Full note:

1. Author One First Last, Author Two First Last, and Author Three First Last, Title of Work, details.

Example:

1. Sarah Johnson, Robert Williams, and Maria Garcia, Collaborative Research in Science (Boston: University Press, 2024), 89.

Shortened note:

2. Johnson, Williams, and Garcia, Collaborative Research, 95.

Bibliography:

Johnson, Sarah, Robert Williams, and Maria Garcia. Collaborative Research in Science. Boston: University Press, 2024.

Author-Date with Three Authors

In-text citation:

(Johnson, Williams, and Garcia 2024, 89)

After first citation, may shorten to:

(Johnson et al. 2024, 100)

Reference list:

Johnson, Sarah, Robert Williams, and Maria Garcia. 2024. Collaborative Research in Science. Boston: University Press.

Four or More Authors in Chicago Style

With four or more authors, Chicago provides flexibility in how names are cited, with differences between the two systems.

Notes-Bibliography with Four or More Authors

Full note (first citation—list all authors):

1. Author One First Last, Author Two First Last, Author Three First Last, and Author Four First Last, Title of Work, details.

Example:

1. Elizabeth Thompson, David Park, Jennifer Chen, and Robert Williams, Global Health Initiatives (London: International Press, 2023), 123.

Shortened note (subsequent citations—use et al.):

2. Thompson et al., Global Health Initiatives, 128.

Bibliography entry (list all authors):

Thompson, Elizabeth, David Park, Jennifer Chen, and Robert Williams. Global Health Initiatives. London: International Press, 2023.

Author-Date with Four or More Authors

In-text citation (first and all subsequent mentions):

(Thompson et al. 2023, 123)

Reference list (list all authors):

Thompson, Elizabeth, David Park, Jennifer Chen, and Robert Williams. 2023. Global Health Initiatives. London: International Press.

Author Name Formatting with Multiple Authors

Chicago style has specific rules for how author names are formatted:

First Author (Inverted Name)

The first author’s name is inverted in the bibliography (Last, First):

Adams, Jennifer, and Michael Chen.

Subsequent Authors (Normal Order)

Authors after the first maintain normal order (First Last):

Adams, Jennifer, and Michael Chen.
Thompson, Elizabeth, David Park, Jennifer Chen, and Robert Williams.

Conjunction Before Last Author

Use “and” before the last author, not commas:

Adams, Jennifer, Michael Chen, and Sarah Williams.
NOT: Adams, Jennifer, Michael Chen, Sarah Williams.

Corporate Authors with Multiple Contributors

When a corporation or institution publishes work attributed to the organization:

Notes-Bibliography Corporate Author

1. Organization Name, Title of Report (Place: Publisher, Year), page.

Example:

1. American Psychological Association, Guidelines for Ethical Research (Washington, DC: APA, 2024), 56.

Bibliography:

American Psychological Association. Guidelines for Ethical Research. Washington, DC: APA, 2024.

Works with Editor(s) Instead of Authors

When editors rather than authors are responsible (common in edited collections):

Notes-Bibliography Multiple Editors

1. Editor One First Last and Editor Two First Last, eds., Title of Collection, details.

Example:

1. Sarah Mitchell and Robert Hughes, eds., Modern Educational Practices (Oxford: University Press, 2023), 145.

Bibliography:

Mitchell, Sarah, and Robert Hughes, eds. Modern Educational Practices. Oxford: University Press, 2023.

Journal Articles with Multiple Authors

Journal articles frequently have multiple authors. The same rules apply as for books.

Notes-Bibliography Multiple Authors Journal Article

Full note:

1. Author One, Author Two, and Author Three, "Article Title," Journal Name 15, no. 2 (2024): page.

Example:

1. Jennifer Adams, Michael Chen, and Sarah Williams, "Advances in Neuroscience Research," Journal of Neuroscience 45, no. 3 (2024): 234-256.

Shortened note:

2. Adams, Chen, and Williams, "Advances in Neuroscience," 240.

Citing Specific Contributions from Multiple Authors

If you want to attribute a specific contribution to one author within a multi-authored work, you may note this:

Notes-Bibliography Specific Author

1. Author One, with Author Two and Author Three, "Article Title," details, at page (Author One's work).

This approach is rarely used in standard citations but can be employed in specific contexts.

When Author Order Matters

In some disciplines (particularly sciences), author order indicates contribution level. Always preserve the original author order, don’t alphabetize.

Step-by-Step Citation Process for Multiple Authors

Step 1: Identify all authors in their publication order.

Step 2: In bibliography entries, invert only the first author’s name (Last, First).

Step 3: Format subsequent authors as First Last.

Step 4: Use “and” before the final author (not a comma).

Step 5: In shortened notes, use et al. after the first author’s last name.

Step 6: Verify all author names match their original spelling and formatting.

Step 7: Apply the same rules for all source types (books, journal articles, etc.).

Common Mistakes to Avoid

1. Alphabetizing author names instead of preserving publication order
2. Inverting all author names in bibliography (only the first)
3. Using commas instead of “and” before the final author
4. Inconsistent use of et al. across citations
5. Omitting all authors from bibliography entries
6. Using semicolons to separate authors instead of commas and “and”
7. Mixing author name order between citations and bibliography

Using Citation Generators with Multiple Authors

Citation tools generally handle multiple author citations well:

• Zotero: Automatically arranges author names correctly
• EasyBib: Input all authors and formats automatically
• Mendeley: Preserves author order from original sources
• CitationMachine: Multi-author templates for various source types

Always verify that all authors are included and properly ordered.

Practice Examples

Example 1: Two Authors in a Book

Notes-Bibliography:

1. Jennifer Adams and Michael Chen, The Future of Urban Planning (New York: City Press, 2024), 78.

Bibliography:
Adams, Jennifer, and Michael Chen. The Future of Urban Planning. New York: City Press, 2024.

Author-Date:

(Adams and Chen 2024, 78)

Adams, Jennifer, and Michael Chen. 2024. The Future of Urban Planning. New York: City Press.

Example 2: Three Authors in a Journal Article

Notes-Bibliography:

1. Sarah Johnson, Robert Williams, and Maria Garcia, "Innovative Approaches to Climate Science," Environmental Research 42, no. 1 (2024): 45-67.

Bibliography:
Johnson, Sarah, Robert Williams, and Maria Garcia. "Innovative Approaches to Climate Science." Environmental Research 42, no. 1 (2024): 45-67.

Author-Date:

(Johnson, Williams, and Garcia 2024, 45)

Johnson, Sarah, Robert Williams, and Maria Garcia. 2024. "Innovative Approaches to Climate Science." Environmental Research 42, no. 1: 45-67.

Example 3: Four Authors

Notes-Bibliography:

1. Elizabeth Thompson, David Park, Jennifer Chen, and Robert Williams, "Global Collaboration in Research," International Journal of Science 38, no. 4 (2024): 234.

Bibliography:
Thompson, Elizabeth, David Park, Jennifer Chen, and Robert Williams. "Global Collaboration in Research." International Journal of Science 38, no. 4 (2024): 234-256.

Author-Date:

(Thompson et al. 2024, 234)

Thompson, Elizabeth, David Park, Jennifer Chen, and Robert Williams. 2024. "Global Collaboration in Research." International Journal of Science 38, no. 4: 234-256.

Mastering Multiple Author Citations

Collaborative research is increasingly common across disciplines. Correctly citing multiple authors acknowledges all contributors and demonstrates your attention to source detail. These guidelines ensure that whether you’re citing two authors or a large research team, your citations accurately represent the work and meet academic standards.

Use our citation generator to verify your multiple author citations, and refer back to this guide when uncertainty arises. With practice, citing multiple authors becomes automatic, reflecting professional scholarly work.