Citazione Stile APA (7a Edizione)

Lewis, C. S. (1982). The screwtape letters: With screwtape proposes a toast. Collier books.

Citazione stile Chigago Style (17a edizione)

Lewis, C. S. The Screwtape Letters: With Screwtape Proposes a Toast. New York: Collier books, 1982.

Citatione MLA (9a ed.)

Lewis, C. S. The Screwtape Letters: With Screwtape Proposes a Toast. Collier books, 1982.