Shortened (Concise) Notes
The second (or subsequent) time a resource is referenced, use a shortened citation form. The short form should include the last name of the author, a brief form of the title (formatted with italics or quotation marks as needed), and the page number. For example:
95. Miller, Quest, 81.
Note: Older versions of Chicago used Ibid. for consecutive references to the same source. This is no longer preferred, as of the 17th edition. You will use shortened notes for all footnote citations after your initial use of a source.