Cita APA

Richard Henry Popkin. (1993). Philosophy made simple. New York: Doubleday.

Chicago Style Citation

Richard Henry Popkin. Philosophy Made Simple. New York: Doubleday, 1993.

Cita MLA

Richard Henry Popkin. Philosophy Made Simple. New York: Doubleday, 1993.

Atenció: Aquestes cites poden no estar 100% correctes.