APA (7th ed.) Zitazioa

Lewis, C. S. (1957). The screwtape letters. MacMillam company.

Chicago Style (17th ed.) Zitazioa

Lewis, C. S. The Screwtape Letters. New York: MacMillam company, 1957.

MLA (9th ed.) Zitazioa

Lewis, C. S. The Screwtape Letters. MacMillam company, 1957.