see Turabian §16.4 (pp. 154 ff.)
If you are citing the same source multiple times in a row, you may use “Ibid.” (Latin, ibidem, “in the same place”) followed by the page number (if different). (See Turabian §16.4.2.)
15 V. Philips Long, The Art of Biblical History (Grand Rapids, MI: Zondervan, 1994), 123.
17 Ibid., 126.
If there are intervening citations to other works, you can use shortened citations after the first full citation.
20 Long, 95.
20 Long, Art of Biblical History, 95.
Including the title of the book or article is only required if necessary for clarity, such as when you cite multiple works by the same author. Likewise, when citing works by different authors with the same last name, you should include each author’s first name in the shortened citations. (See Turabian §16.4.1.)