How to Write Chicago Style Footnotes

Chicago Style, particularly the Notes and Bibliography system, relies heavily on footnotes to cite sources within the text. Unlike in-text parenthetical citations (like APA or MLA), footnotes provide detailed source information at the bottom of the page, allowing readers to consult the full reference immediately. This system is favored in the humanities, especially history, literature, and the arts, where extensive source details are often preferred without interrupting the flow of the main text.

Understanding how to properly construct these footnotes is crucial for academic integrity and clarity. This guide will walk you through the core principles, common source types, and practical tips for mastering Chicago Style footnotes.

Footnotes vs. Endnotes

Before diving into formatting, it's worth noting the distinction between footnotes and endnotes. Both serve the same purpose: providing source citations.

• Footnotes appear at the bottom of the page where the citation number is placed.
• Endnotes are compiled at the end of a chapter or the entire document.

Chicago Style often allows a choice, but footnotes are generally preferred for immediate reference. Always check your instructor's or publisher's specific requirements.

The Basic Structure of a Chicago Footnote

A Chicago footnote typically has two forms: the first full citation and subsequent shortened citations. The first time you cite a source, you provide complete bibliographic information. For all subsequent citations of the same source, you use a shortened form.

First Full Citation

The first footnote for any source includes all the necessary publication details. The general format is:

1. Author's First Name Last Name, Title of Work (Place of Publication: Publisher, Year), Page Number(s).

Notice the key differences from a bibliography entry:

• Author's first name comes first.
• Commas separate elements, not periods (except at the very end).
• Parentheses enclose publication details.

Subsequent Shortened Citation

After the first full citation, subsequent references to the same source are significantly abbreviated.

1. Author's Last Name, Shortened Title, Page Number(s).

If you are citing the exact same page from the immediately preceding footnote, you can use "Ibid." (from the Latin ibidem, meaning "in the same place").

1. Ibid.
2. Ibid., Page Number(s). (Use this if the same source but a different page).

However, many modern style guides and instructors recommend using the shortened title format for all subsequent citations to avoid potential confusion, even if it's the immediately preceding one. Always confirm your preference.

Common Source Types and Examples

Let's explore how to format footnotes for the most frequently used source types.

Books

Books are a foundational source, and their citation can vary based on the number of authors, editors, or if you're citing a specific chapter.

Single Author Book

1. Michael Pollan, The Omnivore's Dilemma: A Natural History of Four Meals (New York: Penguin Press, 2006), 99.

Subsequent:

1. Pollan, Omnivore's Dilemma, 105.

Two or Three Authors

List authors in the order they appear on the title page.

1. Douglas A. Anderson and Martha B. Jones, The Art of Argument (Chicago: University of Chicago Press, 2018), 45.

Subsequent:

1. Anderson and Jones, Art of Argument, 50.

Four or More Authors

List the first author followed by "et al." (from the Latin et alii, meaning "and others").

1. David S. Barnes et al., Foundations of Modern History (Boston: Bedford/St. Martin's, 2020), 123.

Subsequent:

1. Barnes et al., Foundations, 128.

Edited Book (No Specific Author for Chapter)

If you're citing the entire edited collection.

1. Jane Smith, ed., Collected Essays on Postmodernism (London: Routledge, 2015), 78.

Subsequent:

1. Smith, Collected Essays, 80.

Chapter in an Edited Book

When an author contributes a chapter to a larger edited volume.

1. John Doe, "The Impact of AI on Education," in Future Trends in Learning, ed. Alice Brown (New York: Academic Press, 2021), 215.

Subsequent:

1. Doe, "AI on Education," 220.

Journal Articles

Journal articles typically require the volume, issue number, and year of publication. For online articles, include a DOI or a stable URL.

Print Journal Article

1. Sarah M. Lee, "Urban Development and Social Equity," Journal of Urban Studies 35, no. 2 (2010): 187.

Subsequent:

1. Lee, "Urban Development," 190.

Online Journal Article (with DOI)

A DOI (Digital Object Identifier) is a persistent link to an article. Always include it if available.

1. Emily White, "The Psychology of Decision-Making," Cognitive Science Quarterly 12, no. 4 (2015): 345, https://doi.org/10.1080/12345678.2015.1234567.

Subsequent:

1. White, "Psychology of Decision-Making," 348.

Online Journal Article (without DOI, with URL)

If no DOI, use a stable URL. For articles accessed through a database, a URL might not be necessary if the database is widely known. Consult your specific guidelines.

1. Robert J. Miller, "Economic Policy in the 21st Century," Global Economics Journal 7, no. 1 (2019): 56, accessed October 26, 2023, http://www.globaleconomicsjournal.org/miller2019.pdf.

Subsequent:

1. Miller, "Economic Policy," 60.

Websites and Online Content

Citing websites can be tricky due to their transient nature. Provide as much information as possible: author, title of page, title of website, publication/last modified date, and URL.

Website Page with Author

1. Jane Doe, "Understanding Climate Change," Environmental Protection Agency, last modified September 15, 2023, https://www.epa.gov/climate-change/understanding.

Subsequent:

1. Doe, "Climate Change."

Website Page without Author

If no individual author is listed, use the organization or website name.

1. "The History of the Internet," Internet Society, accessed October 26, 2023, https://www.internetsociety.org/history.

Subsequent:

1. Internet Society, "History of the Internet."

Newspaper and Magazine Articles

Distinguish between print and online versions, and include a date.

Print Newspaper Article

1. Sarah Johnson, "Local Economy Shows Growth," Daily Herald (Chicago), October 25, 2023.

Subsequent:

1. Johnson, "Local Economy."

Online Newspaper Article

1. David Chen, "Tech Giants Face New Regulations," New York Times, October 24, 2023, https://www.nytimes.com/2023/10/24/business/tech-regulations.html.

Subsequent:

1. Chen, "Tech Giants."

Other Common Sources

Lecture or Personal Communication

These are typically cited only in footnotes, not in the bibliography, as they are non-recoverable by other researchers.

1. Professor Anna Green, lecture, "Medieval European History," University of Illinois, Urbana-Champaign, October 10, 2023.
2. John Smith, email message to author, September 1, 2023.

Multiple Sources in a Single Footnote

If you need to cite multiple sources for a single point, separate them with semicolons.

1. Michael Pollan, The Omnivore's Dilemma: A Natural History of Four Meals (New York: Penguin Press, 2006), 99; Emily White, "The Psychology of Decision-Making," Cognitive Science Quarterly 12, no. 4 (2015): 345.

Integrating Footnotes into Your Text

Footnote numbers in your text should:

• Be Arabic numerals (1, 2, 3...).
• Be superscript (e.g., "This is a statement. ¹").
• Follow the punctuation mark, such as a period or comma, with no space between the punctuation and the number.
• Be placed at the end of the sentence or clause to which the citation refers.

Example: "The theory of relativity revolutionized physics.¹ However, some early criticisms challenged its universal acceptance.²"

Footnotes vs. Bibliography

It's crucial to understand the relationship between footnotes and your bibliography.

• Footnotes provide in-text citations, usually more detailed for the first reference and abbreviated thereafter.
• Bibliography (or "Works Cited") is an alphabetical list of all sources cited in your paper, typically at the end of the document. Bibliography entries follow a slightly different format (e.g., author's last name first, periods instead of commas between elements, no parentheses for publication info).

Example Comparison:

Footnote (first reference):

1. Michael Pollan, The Omnivore's Dilemma: A Natural History of Four Meals (New York: Penguin Press, 2006), 99.

Bibliography entry: Pollan, Michael. The Omnivore's Dilemma: A Natural History of Four Meals. New York: Penguin Press, 2006.

Always include both footnotes (or endnotes) and a bibliography unless explicitly instructed otherwise.

Tips for Success with Chicago Footnotes

1. Consistency is Key: Once you choose a format (e.g., always using shortened titles instead of Ibid.), stick with it throughout your entire document.
2. Refer to the Manual: The Chicago Manual of Style (CMOS) is the definitive guide. For specific or unusual sources, consult it directly. Many universities also provide condensed style guides.
3. Use Citation Management Tools: Software like Zotero, Mendeley, or EndNote can help you manage your sources and automatically generate footnotes and bibliography entries in Chicago Style. While these tools are helpful, always double-check their output for accuracy.
4. Proofread Carefully: Citation errors are common. Take the time to meticulously review every footnote and bibliography entry. Ensure all elements are present, correctly formatted, and match your source material. While mastering these rules takes practice, remember that tools and services can help. EssayMatrix, for instance, offers professional editing and formatting services to ensure your citations are impeccable and meet academic standards.
5. Page Numbers are Crucial: Always include specific page numbers for direct quotes or references to specific ideas.
6. Understand Your Audience/Instructor: Some instructors may have minor preferences that deviate slightly from the strictest Chicago rules. When in doubt, ask.

Mastering Chicago Style footnotes requires attention to detail and consistent application of its rules. By understanding the basic structure and practicing with various source types, you can produce well-cited, professional academic work.