APA (7th ed.) Citation

Bullock, A., & Hitler, A. (1962). Hitler: A study in tyranny. Penguin.

Chicago Style (17th ed.) Citation

Bullock, Alan, and Adolf Hitler. Hitler: A Study in Tyranny. Harmondsworth, Middlesex: Penguin, 1962.

MLA (8th ed.) Citation

Bullock, Alan, and Adolf Hitler. Hitler: A Study in Tyranny. Penguin, 1962.