Chicago Style Citation Guide

Understanding Chicago Style: Two Systems, One Goal

The Chicago Manual of Style (CMOS) is a widely respected citation style, particularly common in the humanities and social sciences. What often trips students up is that Chicago offers two distinct systems for citing sources: the author-date system and the notes-bibliography system. While both aim for clarity and accuracy in attributing sources, they differ significantly in their presentation. Choosing the right system usually depends on your field of study or specific instructor requirements. The author-date system, as the name suggests, uses parenthetical in-text citations that include the author's last name and the publication year, with a corresponding bibliography at the end of the work. The notes-bibliography system, on the other hand, employs numbered footnotes or endnotes for in-text citations, with a bibliography that lists all sources consulted. For many humanities disciplines, like literature or history, the notes-bibliography system is the standard. In contrast, social sciences often prefer the author-date system. It's crucial to confirm which system your professor or publisher expects before you begin citing.

The Notes-Bibliography System: Footnotes, Endnotes, and Bibliographies

The notes-bibliography system is characterized by its use of superscript numbers within the text, corresponding to either footnotes (at the bottom of the page) or endnotes (at the end of the document). These notes provide the citation details. The first time a source is cited, the note will contain full bibliographic information. Subsequent citations of the same source can be shortened, often including just the author's last name, a shortened title, and the page number. This system can be particularly useful for including supplementary information or brief commentary without disrupting the flow of the main text. Think of it as a way to provide detailed source information without cluttering your prose. For instance, if you're discussing a historical event and want to cite multiple primary sources that offer slightly different perspectives, footnotes allow you to present those details cleanly.

Formatting Notes: The First Citation

When you cite a source for the first time using the notes-bibliography system, the note should be comprehensive. For a book, this typically includes the author's full name, the title of the book (italicized), publication information (city, publisher, year), and the specific page number(s) being referenced. For example: 1. Michel Foucault, Discipline and Punish: The Birth of the Prison, trans. Alan Sheridan (New York: Vintage Books, 1995), 17. For a journal article, the note would include the author's full name, the article title (in quotation marks), the journal title (italicized), volume and issue numbers, publication year, and the page number(s). For instance: 2. Judith Butler, "Performative Acts and Gender Constitution," Theatre Journal 40, no. 4 (1988): 519. Online sources require similar detail, including author, title, website name, publication or last updated date, and a URL or DOI. The exact format can vary slightly depending on the nature of the source, so consulting the latest edition of the Chicago Manual of Style or a reliable online guide is always a good practice.

Subsequent Notes and the Bibliography

After the initial full citation, subsequent notes for the same source are abbreviated. The standard format is author's last name, shortened title, and page number. For example, if you cite Foucault again: 3. Foucault, Discipline and Punish, 45. If you've cited multiple works by the same author, you'll need to include a shortened title to distinguish them. A common practice is to use the first few significant words of the title. At the end of your paper, you'll compile a bibliography. This is an alphabetical list of all the sources you've cited in your notes. The bibliography entries are formatted differently from the notes. For books, the author's last name comes first, followed by their first name. The title is italicized, and publication details follow. For example: Foucault, Michel. Discipline and Punish: The Birth of the Prison. Translated by Alan Sheridan. New York: Vintage Books, 1995. For journal articles, the author's last name precedes their first name, the article title is in quotation marks, and the journal title is italicized. The volume, issue, and year follow, along with the page range of the article. For example: Butler, Judith. "Performative Acts and Gender Constitution." Theatre Journal 40, no. 4 (1988): 519-31. Notice the differences in punctuation and the order of elements compared to the notes. The bibliography aims to provide enough information for a reader to locate the source easily.

The Author-Date System: In-Text Citations and Reference Lists

The author-date system offers a more streamlined approach for in-text citations, which is why it's favored in many scientific and social science fields. Instead of footnotes or endnotes, you use parenthetical citations directly within your text. These citations typically include the author's last name and the year of publication. For example, if you're discussing Foucault's ideas: (Foucault 1995, 17) If the author's name is already part of the sentence, you only need to include the year in parentheses: Foucault argues that the prison system evolved significantly (1995, 17). When citing multiple sources in a single parenthetical reference, list them in alphabetical order by author's last name, separated by semicolons: (Butler 1988; Foucault 1995; Smith 2010). If you are citing multiple works by the same author in the same year, you would add lowercase letters to the year (e.g., 2010a, 2010b). This system requires a reference list at the end of your paper, which is similar to a bibliography but specifically lists only the sources cited in the text. The entries in the reference list are alphabetized by author's last name and follow a specific format.

Formatting References in Author-Date Style

The reference list in the author-date system is crucial. Each entry must provide enough detail for a reader to find the original source. For a book, the format is: Author's Last Name, First Name. Year. Title of Book. City: Publisher. Foucault, Michel. 1995. Discipline and Punish: The Birth of the Prison. Translated by Alan Sheridan. New York: Vintage Books. For a journal article: Butler, Judith. 1988. "Performative Acts and Gender Constitution." Theatre Journal 40 (4): 519-31. Key differences from the notes-bibliography system include the placement of the year (immediately after the author's name) and the use of periods to separate elements. The author's name is presented as Last Name, First Name. For online articles, you'll include the URL or DOI. For example: Smith, John. 2020. "The Impact of Social Media on Political Discourse." Journal of Digital Studies 15 (2): 45-62. https://doi.org/10.1080/12345678.2020.1789012. Consistency is paramount. Once you establish a format for a particular type of source, stick with it throughout your reference list. Always refer to the official Chicago Manual of Style or a reputable online resource for the most up-to-date and specific guidelines.

Common Citation Challenges and Solutions

Citing sources can present unique challenges, especially with less conventional materials. For instance, citing a chapter in an edited book requires careful attention to both the chapter author and the book editor. In the notes-bibliography system, the note would look something like: 1. Author of Chapter, "Title of Chapter," in Title of Book, ed. Editor's Name (City: Publisher, Year), page number. In the author-date system, the reference list entry would be: Author of Chapter, First Name. Year. "Title of Chapter." In Title of Book, edited by Editor's Name, page numbers. City: Publisher. Another common hurdle is citing websites or online articles without clear publication dates or authors. In such cases, use the most recent date available (e.g., last updated date) or the copyright date. If no date is available, use "n.d." (no date). For missing authors, start the citation with the title of the work. When in doubt, err on the side of providing more information rather than less. It's always better to be slightly over-cited than to omit crucial details that could lead to accusations of plagiarism.

• Confirm which Chicago style system (notes-bibliography or author-date) is required.
• Ensure all in-text citations have a corresponding entry in your bibliography or reference list.
• Double-check that all publication details (author, title, publisher, date, page numbers) are accurate.
• Maintain consistent formatting throughout your document for all source types.
• When citing for the first time in notes-bibliography, provide full details; subsequent notes can be shortened.
• Alphabetize your bibliography or reference list correctly by author's last name.
• If unsure about a specific source type, consult the Chicago Manual of Style or a reliable online guide.