APA (7th ed.) Citation

Halphen, L. (1977). Charlemagne and the Carolingian Empire. North-Holland Pub. Co..

Chicago Style (17th ed.) Citation

Halphen, Louis. Charlemagne and the Carolingian Empire. Amsterdam ; New York: North-Holland Pub. Co., 1977.

MLA (8th ed.) Citation

Halphen, Louis. Charlemagne and the Carolingian Empire. North-Holland Pub. Co., 1977.

Warning: These citations may not always be 100% accurate.