Franklin

MLA

Copi, Irving M. Introduction to Logic. 2nd ed. New York, N.Y.: Macmillan, 1961.

APA

Copi, I. M. (1961). Introduction to logic. 2nd ed. New York, N.Y.: Macmillan.

Chicago

Copi, Irving M. Introduction to Logic. 2nd ed. New York, N.Y.: Macmillan, 1961.