APA (7th ed.) Citation

Lewis, C. S., & Baynes, P. (1956). The last battle. Macmillan.

Chicago Style (17th ed.) Citation

Lewis, C. S., and Pauline Baynes. The Last Battle. New York: Macmillan, 1956.

MLA (9th ed.) Citation

Lewis, C. S., and Pauline Baynes. The Last Battle. Macmillan, 1956.