Cita APA (7a ed.)

Lewis, C. S. (1959). The screwtape letters: With screwtape proposes a toast. Harper Collins Publishers.

Cita Chicago Style (17a ed.)

Lewis, C. S. The Screwtape Letters: With Screwtape Proposes a Toast. London,: Harper Collins Publishers, 1959.

Cita MLA (9a ed.)

Lewis, C. S. The Screwtape Letters: With Screwtape Proposes a Toast. Harper Collins Publishers, 1959.