Cita APA

Copi, I. M., & Cohen, C. (1994). Introduction to logic. [s.n.].

Citación estilo Chicago

Copi, Irving M., and Carl Cohen. Introduction to Logic. Singapore: [s.n.], 1994.

Cita MLA

Copi, Irving M., and Carl Cohen. Introduction to Logic. [s.n.], 1994.