APA (7th ed.) Citation

Nicolson, H., & Nicolson, N. (1966). Diaries and letters ([1st American ed.].). Atheneum.

Chicago Style (17th ed.) Citation

Nicolson, Harold, and Nigel Nicolson. Diaries and Letters. [1st American ed.]. New York: Atheneum, 1966.

MLA (8th ed.) Citation

Nicolson, Harold, and Nigel Nicolson. Diaries and Letters. [1st American ed.]. Atheneum, 1966.