APA (7th ed.) Citation

Bullough, D. (1965). The age of Charlemagne. G.P. Putnam's Sons.

Chicago Style (17th ed.) Citation

Bullough, Donald. The Age of Charlemagne. New York: G.P. Putnam's Sons, 1965.

MLA (9th ed.) Citation

Bullough, Donald. The Age of Charlemagne. G.P. Putnam's Sons, 1965.