APA
Copi I. M., Cohen C., . (2007). Essentials of logic. Upper Saddle River, NJ: Pearson Prentice Hall.
Chicago
Copi Irving M, Cohen Carl, . 2007. Essentials of logic. Upper Saddle River, NJ: Pearson Prentice Hall.
Harvard
Copi I. M., Cohen C., . (2007). Essentials of logic. Upper Saddle River, NJ: Pearson Prentice Hall.
MLA
Copi Irving M, Cohen Carl, . Essentials of logic. Upper Saddle River, NJ: Pearson Prentice Hall. 2007.