APA (7th ed.) Citation

Pollard, A. F. (1932). Factors in modern history (3d ed.). Beacon Press.

Chicago Style (17th ed.) Citation

Pollard, A. F. Factors in Modern History. 3d ed. Boston: Beacon Press, 1932.

MLA (9th ed.) Citation

Pollard, A. F. Factors in Modern History. 3d ed. Beacon Press, 1932.