APA aipamena

Copi, I. M., & Cohen, C. (2019). Introduction to Logic (15th.). Routledge.

Chicago Style aipamena

Copi, Irving M., and Carl Cohen. Introduction to Logic. 15th. New York: Routledge, 2019.

MLA aipamena

Copi, Irving M., and Carl Cohen. Introduction to Logic. 15th. Routledge, 2019.