APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.