APA (7th ed.) Citation

Lewis & Papas. (2008). The screwtape letters: And the screwtape proposes a toast. Harper Collins.

Chicago Style (17th ed.) Citation

Lewis and Papas. The Screwtape Letters: And the Screwtape Proposes a Toast. New York: Harper Collins, 2008.

MLA (8th ed.) Citation

Lewis and Papas. The Screwtape Letters: And the Screwtape Proposes a Toast. Harper Collins, 2008.

Warning: These citations may not always be 100% accurate.