Cita APA (7th ed.)
Copi, I. M., & Cohen, C. (2002). Introduction to logic (11th ed.). Prentice Hall.
Cita Chicago (17th ed.)
Copi, Irving M., i Carl Cohen. Introduction to Logic. 11th ed. Upper Saddle River, N.J. : New Delhi: Prentice Hall, 2002.
Cita MLA (9th ed.)
Copi, Irving M., i Carl Cohen. Introduction to Logic. 11th ed. Prentice Hall, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.