Citation, Documentation of Sources

Q. How would you cite Aquinas’s Summa Theologica, Question 65, Article 4? Thank you.

A. If you are using Chicago style, follow the form at CMOS 14.243 (“Identifying numbers in classical references”):

Aquinas, Summa Theologica 1.65.4.

Note that you need a part number as well as a question and article number.

[This answer relies on the 17th edition of CMOS (2017) unless otherwise noted.]