APA Format
Copi, Irving M; Copi, Irving M. (1978).
Introduction to logic / Irving M. Copi
. New York :: The Macmillan,.
MLA Format
Copi, Irving M; Copi, Irving M.
Introduction to logic / Irving M. Copi
. New York :: The Macmillan,, 1978
Chicago Format
Copi, Irving M; Copi, Irving M. Introduction to logic / Irving M. Copi. New York :: The Macmillan,, 1978.