Cita APA (7th ed.)

Lewis, C. (2001). The Screwtape letters: Screwtape proposes a toast. Harper One.

Cita Chicago (17th ed.)

Lewis, C.S. The Screwtape Letters: Screwtape Proposes a Toast. New York: Harper One, 2001.

Cita MLA (9th ed.)

Lewis, C.S. The Screwtape Letters: Screwtape Proposes a Toast. Harper One, 2001.