Bullough, D. A. (1966). The age of Charlemagne ([1st American ed.].). Putnam.
Chicago Style (17th ed.) CitationBullough, Donald A. The Age of Charlemagne. [1st American ed.]. New York: Putnam, 1966.
MLA (9th ed.) CitationBullough, Donald A. The Age of Charlemagne. [1st American ed.]. Putnam, 1966.
Warning: These citations may not always be 100% accurate.