APA (7th ed.) Citation

Sellery, G. C., & Krey, A. C. (1929). Medieval foundations of western civilization. Harper & brothers.

Chicago Style (17th ed.) Citation

Sellery, George C., and August C. Krey. Medieval Foundations of Western Civilization. New York; London: Harper & brothers, 1929.

MLA (9th ed.) Citation

Sellery, George C., and August C. Krey. Medieval Foundations of Western Civilization. Harper & brothers, 1929.