If you're crafting a paper using the Chicago Manual of Style (CMOS), it's customary to incorporate both footnotes and a bibliography. A complete footnote includes the same details as your bibliography entry albeit in a slightly different format, accompanied by page numbers where the referenced material can be located in the source. However, if you're referencing the same source consecutively 3 times or more, you may opt for 'ibid.' (derived from the Latin term 'ibidem,' meaning 'in the same place') instead of repeating the citation details other than the page numbers. The 17th edition of CMOS, released in 2017, advises against the use of 'ibid.' as it may confuse readers accessing electronic works. Consult your instructor or editor to determine the appropriate method.
Procedures
Citing the Same Source Sequentially

- Example of complete footnote style for a book: F. Scott Fitzgerald, The Great Gatsby (New York: Scriber, 2004), 88.

- Example of abbreviated footnote format for a book: F. Scott Fitzgerald, The Great Gatsby, 92-94.

- Example of sequential citations:
1. F. Scott Fitzgerald, The Great Gatsby (New York: Scriber, 2004), 88.
2. F. Scott Fitzgerald, The Great Gatsby, 92-94.
3. Ibid.

- Example of sequential citations with page numbers:
1. F. Scott Fitzgerald, The Great Gatsby (New York: Scriber, 2004), 88.
2. F. Scott Fitzgerald, The Great Gatsby, 92-94.
3. Ibid.
4. Ibid., 96-98.
Advice: Even if your paper will be in print, ensure that your use of 'Ibid.' doesn't confuse readers. If your sequential citations span two pages, consider including a shortened citation as the first footnote on the second page to aid reader navigation.
Utilizing an Abbreviated Citation

- Example of a full footnote style for a book: Ernest Hemingway, For Whom the Bell Tolls (New York: Scribner, 1995), 112.

- Example of sequential citations using a shortened format:
1. Ernest Hemingway, For Whom the Bell Tolls (New York: Scribner, 1995), 112.
2. Hemingway, 114-116.
3. Hemingway, 122.
Exception: In cases where you have 2 or more works by the same author, always include the titles in your shortened citations to aid reader differentiation.

- Example of nonconsecutive shortened citations:
1. Ernest Hemingway, For Whom the Bell Tolls (New York: Scribner, 1995), 120.
2. F. Scott Fitzgerald, Tender Is the Night (New York: Scribner, 1995), 32.
3. Hemingway, For Whom the Bell Tolls, 99-101.
4. Hemingway, 104.
5. Fitzgerald, Tender Is the Night, 73.
6. Hemingway, For Whom the Bell Tolls, 22-27.