APA (7th ed.) Citation

Lewis, C. S. (1961). The screwtape letters [and] Screwtape proposes a toast (Large type ed.). Macmillan.

Chicago Style (17th ed.) Citation

Lewis, C. S. The Screwtape Letters [and] Screwtape Proposes a Toast. Large type ed. New York: Macmillan, 1961.

MLA (9th ed.) Citation

Lewis, C. S. The Screwtape Letters [and] Screwtape Proposes a Toast. Large type ed. Macmillan, 1961.