Cita APA (7th ed.)

Copi, I. M., & Cohen, C. (1990). Introduction to logic (8th ed.). Macmillan Publishing Company.

Cita Chicago (17th ed.)

Copi, Irving M., i Carl Cohen. Introduction to Logic. 8th ed. New York: Macmillan Publishing Company, 1990.

Cita MLA (9th ed.)

Copi, Irving M., i Carl Cohen. Introduction to Logic. 8th ed. Macmillan Publishing Company, 1990.