APA (7th ed.) Citation

Popkin, R., & Stroll, A. (1967). Philosophy made simple. Made Simple Books.

Chicago Style (17th ed.) Citation

Popkin, Richard, and Avrum Stroll. Philosophy Made Simple. New York: Made Simple Books, 1967.

MLA (9th ed.) Citation

Popkin, Richard, and Avrum Stroll. Philosophy Made Simple. Made Simple Books, 1967.