Cita APA (7th ed.)

Lewis, C. (2001). The screwtape letters: With Screwtape Proposes a Toast. HarperCollins.

Cita Chicago (17th ed.)

Lewis, C.S. The Screwtape Letters: With Screwtape Proposes a Toast. New York,New York: HarperCollins, 2001.

Cita MLA (9th ed.)

Lewis, C.S. The Screwtape Letters: With Screwtape Proposes a Toast. HarperCollins, 2001.