see Turabian §16.4.1 (pp. 164–166.)

If you are citing the same source multiple times, you may use shortened citations after the first full citation.

²⁰ Long, Art of Biblical History, 95.

²¹ Long, “Reading the Old Testament,” 102.

²² Branson and Martínez, 160.

²³ Klein, Hubbard, and Blomberg, 76.

²⁴ Schultze et al., 189.

Including a shortened title (up to 4 words) for 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 or initials in the shortened citations.

see Turabian §17.9.3 (p. 205–206)

If you find a useful quote from another source in the one that you are reading, you must try to find the original source of the quote so that you can examine it in context and verify its accuracy. However, if you cannot track down the original, you may use the following form.

Junior, the Third, etc.

see Turabian §23.1.6 (pp. 334–335); §24.2.1 (p. 345)

Do not precede Sr., Jr., III, etc. with a comma, unless the name is inverted, as in the bibliography.