Overview
Note: In the 17th Edition, the use of "Ibid" is now discouraged in favor of using shortened citations. For documents written utilizing the 16th or earlier editions of the Chicago Style Manual, you may still see 'ibid" used as seen below, but you should not use it in new papers.
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.