APA (7th ed.) Citation

Guillemain, B. (1960). The early Middle Ages. Hawthorn Books, Publishers.

Chicago Style (17th ed.) Citation

Guillemain, Bernard. The Early Middle Ages. New York: Hawthorn Books, Publishers, 1960.

MLA (9th ed.) Citation

Guillemain, Bernard. The Early Middle Ages. Hawthorn Books, Publishers, 1960.