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 Clarke, and August Charles Krey. Medieval Foundations of Western Civilization. New York and London: Harper & Brothers, 1929.

MLA (9th ed.) Citation

Sellery, George Clarke, and August Charles Krey. Medieval Foundations of Western Civilization. Harper & Brothers, 1929.