Cita APA (7a ed.)

Lewis, C. S., & Walsh, C. (1981). The visionary christian. Collier Books.

Cita Chicago Style (17a ed.)

Lewis, C. S., y Chad Walsh. The Visionary Christian. New York: Collier Books, 1981.

Cita MLA (9a ed.)

Lewis, C. S., y Chad Walsh. The Visionary Christian. Collier Books, 1981.