APA (7th ed.) Citation

Copi, I. M., & Cohen, C. (1994). Introduction to logic (9th edition.). Prentice Hall.

Chicago Style (17th ed.) Citation

Copi, Irving M., and Carl Cohen. Introduction to Logic. 9th edition. Englewood Cliffs: Prentice Hall, 1994.

MLA (8th ed.) Citation

Copi, Irving M., and Carl Cohen. Introduction to Logic. 9th edition. Prentice Hall, 1994.

Warning: These citations may not always be 100% accurate.