APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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