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Chicago Style Guide, for 17th Edition

Ibid

Overview

Note: In the 17th Edition, the use of "Ibid" is now discouraged in favor of using shortened citations

If you consecutively cite the same source two or more times in a note (complete or shortened), you may use the word “Ibid” instead. Ibid is short for the Latin ibidem, which means “in the same place”. If you’re referencing the same source but different page, follow ‘Ibid’ with a comma and the new page number(s).

Examples

          1. Newton N. Minow and Craig L. LaMay, Inside the Presidential Debates: Their Improbable Past and Promising Future (Chicago: University of Chicago Press, 2008), 24-25.

          2. Minow and LaMay, Presidential Debates, 24-25.

          3. Ibid.

          4. Ibid, 28-30.