APA (7th ed.) Citation

Nicolson, H. G. S., & Nicolson, N. (1967). The war years, 1939-1945. Atheneum.

Chicago Style (17th ed.) Citation

Nicolson, Harold George Sir, and Nigel Nicolson. The War Years, 1939-1945. New York: Atheneum, 1967.

MLA (9th ed.) Citation

Nicolson, Harold George Sir, and Nigel Nicolson. The War Years, 1939-1945. Atheneum, 1967.