APA (7th ed.) Citation

Page, B., Leitch, D., & Knightley, P. (1968). Philby: The spy who betrayed a generation. Deutsch.

Chicago Style (17th ed.) Citation

Page, Bruce, David Leitch, and Phillip Knightley. Philby: The Spy Who Betrayed a Generation. London: Deutsch, 1968.

MLA (9th ed.) Citation

Page, Bruce, et al. Philby: The Spy Who Betrayed a Generation. Deutsch, 1968.