Chicago Manual of Style 17th Edition
This section contains information on The Chicago Manual of Style method of document formatting and citation. These resources follow the seventeenth edition of The Chicago Manual of Style, which was issued in 2017.
Contributors: Jessica Clements, Elizabeth Angeli, Karen Schiller, S. C. Gooch, Laurie Pinkert, Allen Brizee, Ryan Murphy, Vanessa Iacocca, Ryan Schnurr
Last Edited: 2018-01-31 02:26:18
Please note that while these resources reflect the most recent updates in the 17th edition of The Chicago Manual of Style concerning documentation practices, you can review a full list of updates concerning usage, technology, professional practice, etc. at The Chicago Manual of Style Online.
To see a side-by-side comparison of the three most widely used citation styles, including a chart of all CMOS citation guidelines, see the Citation Style Chart.
The Chicago Manual of Style (CMOS) covers a variety of topics from manuscript preparation and publication to grammar, usage, and documentation and has been lovingly called the “editors’ bible.” The material in this resource focuses primarily on one of the two CMOS documentation styles: the Notes-Bibliography System (NB), which is used by those in literature, history, and the arts. The other documentation style, the Author-Date System, is nearly identical in content but slightly different in form and is preferred in the social sciences.
In addition to consulting The Chicago Manual of Style (17th ed.) for more information, students may also find it useful to consult Kate L. Turabian's Manual for Writers of Research Papers, Theses, and Dissertations (8th ed.). This manual, which presents what is commonly known as the "Turabian" citation style, follows the two CMOS patterns of documentation but offers slight modifications suited to student texts.
Notes and Bibliography (NB) in Chicago style
The Chicago NB system is often used in the humanities and provides writers with a system for referencing their sources through footnote or endnote citation in their writing and through bibliography pages. It also offers writers an outlet for commenting on those cited sources. The NB system is most commonly used in the discipline of history.
The proper use of the NB system can protect writers from accusations of plagiarism, which is the intentional or accidental uncredited use of source material created by others. Most importantly, properly using the NB system builds credibility by demonstrating accountability to source material.
If you are asked to use the Chicago NB format, be sure to consult The Chicago Manual of Style (17th ed.). Students should also refer to A Manual for Writers of Research Papers, Theses, and Dissertations (8th ed.). Both are available in most writing centers and reference libraries and in bookstores.
Introduction to Notes
In the NB system, you should include a note (endnote or footnote) each time you use a source, whether through a direct quote or through a paraphrase or summary. Footnotes will be added at the end of the page on which the source is referenced, and endnotes will be compiled at the end of each chapter or at the end of the entire document.
In either case, a superscript number corresponding to a note with the bibliographic information for that source should be placed in the text following the end of the sentence or clause in which the source is referenced.
If a work includes a bibliography, then it is not necessary to provide full publication details in notes. However, if a bibliography is not included with a work, the first note for each source should include all relevant information about the source: author’s full name, source title, and facts of publication. If you cite the same source again, or if a bibliography is included in the work, the note need only include the surname of the author, a shortened form of the title (if more than four words), and page number(s). However, in a work that does not include a bibliography, it is recommended that the full citation be repeated when it is first used in a new chapter.
In contrast to earlier editions of CMOS, if you cite the same source two or more times consecutively, CMOS recommends using shortened citations. In a work with a bibliography, the first reference should use a shortened citation which includes the author’s name, the source title, and the page number(s), and consecutive references to the same work may omit the source title and simply include the author and page number. Although discouraged by CMOS, if you cite the same source and page number(s) from a single source two or more times consecutively, it is also possible to utilize the word “Ibid.,” an abbreviated form of the Latin ibidem, which means “in the same place,” as the corresponding note. If you use the same source but a different page number, the corresponding note should use “Ibid.” followed by a comma and the new page number(s).
In the NB system, the footnote or endnote itself begins with the appropriate full-sized number, followed by a period and then a space.
Introduction to Bibliographies
In the NB system, the bibliography provides an alphabetical list of all sources used in a given work. This page, most often titled Bibliography, is usually placed at the end of the work preceding the index. It should include all sources cited within the work and may sometimes include other relevant sources that were not cited but provide further reading.
Although bibliographic entries for various sources may be formatted differently, all included sources (books, articles, Web sites, etc.) are arranged alphabetically by author’s last name. If no author or editor is listed, the title or, as a last resort, a descriptive phrase may be used.
Though useful, a bibliography is not required in works that provide full bibliographic information in the notes.
All entries in the bibliography will include the author (or editor, compiler, translator), title, and publication information.
The author’s name is inverted in the bibliography, placing the last name first and separating the last name and first name with a comma; for example, John Smith becomes Smith, John. (If an author is not listed first, this applies to compilers, translators, etc.)
Titles of books and journals are italicized. Titles of articles, chapters, poems, etc. are placed in quotation marks.
The year of publication is listed after the publisher or journal name.
In a bibliography, all major elements are separated by periods.
For more information and specific examples, see the sections on Books and Periodicals.
Please note that this OWL resource provides basic information regarding the formatting of entries used in the bibliography. For more information about Selected Bibliographies, Annotated Bibliographies, and Bibliographic Essays, please consult Chapter 14.61 of The Chicago Manual of Style (17th ed.).
←Back to Chicago Citation Guide
How to reference a Website using the Chicago Manual of Style
The most basic entry for a website consists of the author name(s), page title, website title, web address, and date accessed.
Last Name, First Name. “Page Title.” Website Title. Web Address (retrieved Date Accessed).
Smith, John. “Obama inaugurated as President.” CNN.com. http://www.cnn.com/POLITICS/01/21/obama_inaugurated/index.html (accessed February 1, 2009).
The first author’s name should be reversed, with a comma being placed after the last name and a period after the first name (or any middle name). Titles and affiliations associated with the author should be omitted. A suffix, such as a roman numeral or Jr./Sr., should appear after the author’s given name, preceded by a comma.
For a page with two or more authors, list them in the order as they appear on the website. Only the first author’s name should be reversed, while the others are written in normal order. Separate author names by a comma.
Smith, John, and Jane Doe. “Obama inaugurated as President.” CNN.com. http://www.cnn.com/POLITICS/01/21/obama_inaugurated/index.html (accessed February 1, 2009).
If no author is available, begin the citation with the website owner.
Cable News Network. “Obama inaugurated as President.” CNN.com. http://www.cnn.com/POLITICS/01/21/obama_inaugurated/index.html (accessed February 1, 2009).
The full page title, which is followed by a period, should be placed within quotation marks. Place the period within the quotation marks. Then include the website title, followed by a period. If the website title is not available, include the website owner in its place.
Smith, John. “Obama inaugurated as President.” Cable News Network. http://www.cnn.com/POLITICS/01/21/obama_inaugurated/index.html (accessed February 1, 2009).
Include the web address of the page. Next, place the text “accessed” and the date on which you accessed the website (written in the format of “month day, year”) in parentheses. Conclude the citation with a period after the parentheses.
For informal websites (such as home page or fan websites) or websites without formal titles, use descriptive phrases in your citation in place of page or website titles.
If the website has a print counterpart, such as the website for a newspaper, place the website title in italics.
Smith, John. “Catalonia Declares Independence from Spain.” New York Times. http://www.newyorktimes.com/POLITICS/11/21/catalonia_spain.html (accessed February 1, 2017).
←Back to Chicago Citation Guide