APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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