Παραπομπή APA

Copi, I. M. Introduction to Logic by Irving M Copi and Carl Cohen (5,7,11.). 1978,1986,1960,1997.

Παραπομπή Chicago Style

Copi, Irving M. Introduction to Logic by Irving M Copi and Carl Cohen. 5,7,11. 1978,1986,1960,1997.

Παραπομπή MLA

Copi, Irving M. Introduction to Logic by Irving M Copi and Carl Cohen. 5,7,11. 1978,1986,1960,1997.