Copi, I. M. (1986). Introduction to logic (7th ed.). Macmillan ; Collier Macmillan.

Copi, Irving M. Introduction to Logic. 7th ed. New York : London: Macmillan ; Collier Macmillan, 1986.

Copi, Irving M. Introduction to Logic. 7th ed. Macmillan ; Collier Macmillan, 1986.