APA-referens (7:e uppl.)

Copi, I. M. c. (2020). Introduction to Logic (15th.). Routledge.

Chicago-referens (17:e uppl.)

Copi, Irring M; cohen. Introduction to Logic. 15th. New York: Routledge, 2020.

MLA-referens (9:e uppl.)

Copi, Irring M; cohen. Introduction to Logic. 15th. Routledge, 2020.