Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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