Chicago Manual of Style 17th Edition: What’s New

Fall is here, and so are the winds of change for the Chicago Manual of Style (CMoS)! This past September, a new edition of the CMoS was released. It tackles some new topics, while also expanding on existing citation specifications.

Here is a list of the biggest changes in the 17th edition of CMoS:

Titles for Websites

In a departure from the 16th edition, the formatting for titles of websites can now be treated in various ways. What dictates the treatment is whether the website also has a print counterpart, such as newspaper websites. If the site has one, the title is in italics. If it does not, then it is not stylized.

Title examples:

  • The New York Times
  • Wikipedia
  • Forbes
  • Buzzfeed

Use of “ibid.” 

In previous versions of CMoS, the abbreviation “ibid” was used in footnotes to show the reader that the previous cited source is being cited immediately after. The 17th edition, however, discourages the use of “ibid” in favor of shortened citations. The footnote can instead start with the author’s last name, and include the page number.

Here are some example congruent footnote citations without “ibid.”:

  1. Steven T. Brown, Tokyo Cyberpunk: Posthumanism in Japanese Visual Culture (New York: Palgrave Macmillan, 2010), 124.
  2. Brown, 11.
  3. Brown, 17.

 Repeating the Year in Certain Author-date Citations

Chicago Manual of Style has two main sub-styles: “author-date” and “footnote-bibliography.” In an author-date reference list entry, the year may now be repeated for sources that are also identified by month and day, such as journals or websites. This, however, is optional.


Germano, William. 2017. “Futurist Shock.” Lingua Franca (blog). Chronicle of Higher Education, February 15, 2017. //

New York Times. 2002. “In Texas, Ad Heats Up Race for Governor.” July 30, 2002.

Help your students cite in MLA format with our free EasyBib citation tools! We also have guides to help students make APA citations for books, websites, and other sources.

Elise Barbeau

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