APA (7th ed.) Citation

Popkin, R. H., & Stroll, A. (1958). Philosophy made simple. Made Simple Books.

Chicago Style (17th ed.) Citation

Popkin, Richard H., and Avrum Stroll. Philosophy Made Simple. New York: Made Simple Books, 1958.

MLA (9th ed.) Citation

Popkin, Richard H., and Avrum Stroll. Philosophy Made Simple. Made Simple Books, 1958.