Cita APA

Popkin, R. H. 1., & Stroll, A. 1. (1956). Philosophy made simple. New York, New York: Made Simple Books.

Citación estilo Chicago

Popkin, Richard Henry 1923-2005, y Avrum 1921- Stroll. Philosophy Made Simple. New York, New York: Made Simple Books, 1956.

Cita MLA

Popkin, Richard Henry 1923-2005, y Avrum 1921- Stroll. Philosophy Made Simple. New York, New York: Made Simple Books, 1956.