When should I use the Notes-Bibliography system versus the Author-Date system?

The Notes-Bibliography system is primarily used in the humanities, such as history, literature, and the arts, for its detailed footnotes/endnotes. The Author-Date system is favored in the social sciences and natural sciences, like sociology or biology, for its concise in-text parenthetical citations. Always check your instructor's or publisher's requirements.

What's the main difference between a footnote and a bibliography entry for the same source?

A footnote (or endnote) provides the full source information the first time it's cited, followed by shortened versions. It includes specific page numbers for the cited material. A bibliography entry, however, lists all sources alphabetically at the end of the paper with full publication details, but generally without specific page numbers unless citing a chapter from an edited book.

How do I cite an online source like a website in Chicago style?

For the Notes-Bibliography system, a footnote would include "Page Title," *Website Name*, Last modified/accessed Date, URL. The bibliography entry would list *Website Name*, "Page Title," Last modified/accessed Date, URL. For Author-Date, the in-text citation is (Author Year) and the reference list entry is Author. Year. "Page Title." *Website Name*. Accessed Date. URL.

Do I need a separate title page for my paper in Chicago style?

A separate title page is optional in Chicago style, but it is often required by instructors. If you use one, it should include your paper's title, your name, course information, and the date, all centered. If you don't use a separate title page, the title is typically placed on the first page of your text, centered, a few lines from the top.

Chicago Citation Style: A Complete Guide with Examples

Understanding Chicago Citation Style

The Chicago Manual of Style (CMOS) offers a robust and widely respected citation system, primarily used in the humanities, social sciences, and natural sciences. Unlike some other styles, Chicago offers two distinct citation systems:

Notes-Bibliography System: Favored in the humanities (literature, history, arts), this system uses footnotes or endnotes for in-text citations and a comprehensive bibliography at the end of the document.
Author-Date System: Preferred in the social sciences (economics, sociology, anthropology) and natural sciences, this system uses parenthetical in-text citations and a reference list.

Choosing the correct system depends on your discipline and your instructor's or publisher's requirements. Always confirm which system you need to use before starting your research and writing.

The Notes-Bibliography System

This system is characterized by its use of numbered footnotes or endnotes in the text, which correspond to detailed source information at the bottom of the page (footnotes) or at the end of the paper (endnotes). A full bibliography follows the main text.

Footnotes/Endnotes

When you cite a source, you place a superscript number at the end of the sentence or clause containing the cited material. This number corresponds to a numbered note that provides the source details.

First Reference: The first time you cite a source, the note should contain full bibliographic information.

Book:

1. Michael Pollan, The Omnivore's Dilemma: A Natural History of Four Meals (New York: Penguin Press, 2006), 99–100.

Journal Article:

2. Susan S. Sontag, "The Imagination of Disaster," Commentary 40, no. 4 (1965): 42.

Website:

3. "About the University," University of Chicago, accessed May 20, 2023, https://www.uchicago.edu/about/.

Subsequent References (Shortened Notes): After the first full citation, subsequent notes for the same source can be shortened, typically including only the author's last name, a shortened title (if necessary), and the page number.

Book:

4. Pollan, Omnivore's Dilemma, 15.

Journal Article:

5. Sontag, "Imagination of Disaster," 45.

Bibliography

The bibliography is an alphabetized list of all sources cited in your work, appearing at the end of your paper. Bibliography entries provide more comprehensive details than shortened notes and often differ slightly in punctuation and element order from the first note.

General Formatting:

List entries alphabetically by the author's last name.
Use a hanging indent for each entry (the first line is flush left, subsequent lines are indented).
Do not number bibliography entries.

Examples:

Book (single author):

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

Book (two or more authors):

Ward, Geoff, and Sarah M. Evans. The Complete Guide to Writing and Reading. Boston: Bedford/St. Martin's, 2018.

Chapter in an edited book:

Kelly, John F. "The Origins of the Irish Diaspora." In The Irish Diaspora: A Global Perspective, edited by Andy Bielenberg, 23–45. London: Routledge, 2000.

Journal Article (print):

Sontag, Susan S. "The Imagination of Disaster." Commentary 40, no. 4 (1965): 42–49.

Journal Article (online, with DOI):

Schuman, Howard, and Cheryl Rieger. "Historical Trends in the Subjective Experience of Social Class." Public Opinion Quarterly 73, no. 3 (2009): 510–33. doi:10.1093/poq/nfp039.

Website:

University of Chicago. "About the University." Accessed May 20, 2023. https://www.uchicago.edu/about/.

The Author-Date System

This system is more concise, using parenthetical citations within the text that refer readers to an alphabetized reference list at the end of the paper. This is often preferred in the sciences because it allows for quick identification of the source year.

In-Text Citations

An in-text citation typically includes the author's last name and the year of publication, often with a page number for direct quotes or specific passages.

General Format: (Author Year, Page Number)

Direct Quote: "The quick brown fox jumps over the lazy dog" (Smith 2010, 25).
Paraphrase/Summary: This idea has been extensively discussed (Jones 2015).
Author mentioned in text: Smith (2010, 25) argues that "the quick brown fox jumps over the lazy dog."
Two Authors: (Ward and Evans 2018, 78)
Three or More Authors: (Chang et al. 2020, 112)

Reference List

The reference list, similar to a bibliography, provides full bibliographic details for every source cited in your paper. It is alphabetized by author's last name and uses a hanging indent.

Examples:

Book (single author):

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

Book (two or more authors):

Ward, Geoff, and Sarah M. Evans. 2018. The Complete Guide to Writing and Reading. Boston: Bedford/St. Martin's.

Chapter in an edited book:

Kelly, John F. 2000. "The Origins of the Irish Diaspora." In The Irish Diaspora: A Global Perspective, edited by Andy Bielenberg, 23–45. London: Routledge.

Journal Article (print):

Sontag, Susan S. 1965. "The Imagination of Disaster." Commentary 40, no. 4: 42–49.

Journal Article (online, with DOI):

Schuman, Howard, and Cheryl Rieger. 2009. "Historical Trends in the Subjective Experience of Social Class." Public Opinion Quarterly 73, no. 3: 510–33. doi:10.1093/poq/nfp039.

Website:

University of Chicago. 2023. "About the University." Accessed May 20. https://www.uchicago.edu/about/.

Notice the slight differences in punctuation and date placement between the Notes-Bibliography and Author-Date reference entries. The year comes immediately after the author's name in Author-Date.

General Chicago Formatting Guidelines

Beyond citations, Chicago style also offers general formatting recommendations for your paper.

Paper Layout

Margins: 1 inch on all sides.
Font: A readable font, such as Times New Roman or Garamond, 12-point.
Line Spacing: Double-space the main text. Block quotes, footnotes/endnotes, bibliography/reference list entries (within themselves, but double-space between entries), and table/figure captions are typically single-spaced.
Page Numbers: Arabic numerals (1, 2, 3...) in the upper right corner, starting from the first page of the main text (or the first page of the paper if no title page).

Title Page

A separate title page is optional but often required. If used, it should include:

Title: Centered, about one-third down the page, in title case.
Your Name: Centered, below the title.
Course Name, Instructor's Name, and Date: Centered, toward the bottom of the page, on separate lines.

If no separate title page, the title appears on the first page of the text, centered, a few lines below the top margin.

Headings

Chicago style is flexible with headings, but consistency is key. A common hierarchy uses different font sizes, bolding, or italics.

Main Headings (Level 1): Centered, bold, title case.
Subheadings (Level 2): Flush left, bold, title case.
Sub-subheadings (Level 3): Flush left, italics, title case.

Block Quotes

For prose quotations of five or more lines, or poetry quotations of two or more lines, use a block quote:

Indent the entire block 0.5 inches from the left margin.
Do not use quotation marks around the block quote.
Single-space the block quote.
The parenthetical citation or note number comes after the final punctuation of the block quote.

Why Accurate Citation Matters

Mastering citation styles like Chicago is more than just following rules; it's a cornerstone of academic integrity. Proper citation:

Avoids Plagiarism: Gives credit where credit is due, preventing the unintentional use of others' work as your own.
Enhances Credibility: Demonstrates that your research is thorough and your arguments are supported by reliable sources.
Allows for Verification: Enables your readers to locate and verify your sources, promoting transparency and academic discourse.
Shows Respect: Acknowledges the intellectual contributions of other scholars and researchers.

While understanding these rules is crucial, tools like Humanize can assist in refining your prose and formatting to ensure your citations are presented clearly and correctly within your overall document, helping you produce polished and academically sound work.

Conclusion

The Chicago Manual of Style provides a comprehensive framework for scholarly writing, offering two distinct citation systems to suit various academic disciplines. Whether you use the Notes-Bibliography or Author-Date system, consistency, attention to detail, and a thorough understanding of the guidelines are paramount. By diligently applying these principles, you not only uphold academic integrity but also contribute to the clarity and professionalism of your scholarly work. Always refer to the latest edition of The Chicago Manual of Style for the most up-to-date and specific guidance.