Cita APA (7a ed.)

Lewis, C. S. (1988). The screwtape letters. Fount Paperbacks.

Cita Chicago Style (17a ed.)

Lewis, C. S. The Screwtape Letters. London: Fount Paperbacks, 1988.

Cita MLA (9a ed.)

Lewis, C. S. The Screwtape Letters. Fount Paperbacks, 1988.