APA (7th ed.) Citation

Nicolson, H. G., & Nicolson, N. (1966). Diaries and letters. Atheneum.

Chicago Style (17th ed.) Citation

Nicolson, Harold George, and Nigel Nicolson. Diaries and Letters. New York: Atheneum, 1966.

MLA (9th ed.) Citation

Nicolson, Harold George, and Nigel Nicolson. Diaries and Letters. Atheneum, 1966.