Cita APA (7th ed.)

Kreyche, G. F. (1976). Thirteen thinkers: A sampler of great philosophers. University Press of America.

Cita Chicago (17th ed.)

Kreyche, Gerald F. Thirteen Thinkers: A Sampler of Great Philosophers. Washington, D.C.: University Press of America, 1976.

Cita MLA (9th ed.)

Kreyche, Gerald F. Thirteen Thinkers: A Sampler of Great Philosophers. University Press of America, 1976.