APA (7th ed.) Citation

Bullough, D. A. (1966). The age of Charlemagne ([1st American ed.].). Putnam.

Chicago Style (17th ed.) Citation

Bullough, Donald A. The Age of Charlemagne. [1st American ed.]. New York: Putnam, 1966.

MLA (9th ed.) Citation

Bullough, Donald A. The Age of Charlemagne. [1st American ed.]. Putnam, 1966.