Cita APA (7th ed.)

Popkin, R. H., & Stroll, A. (1956). Philosophie made simple. Doubleday & Company.

Cita Chicago (17th ed.)

Popkin, Richard H., i Avrum Stroll. Philosophie Made Simple. Garden City [u.a.]: Doubleday & Company, 1956.

Cita MLA (8th ed.)

Popkin, Richard H., i Avrum Stroll. Philosophie Made Simple. Doubleday & Company, 1956.