APA (7th ed.) Citation

Duby, G. (1985). William Marshal: The flower of chivalry (1st American ed.). Pantheon Books.

Chicago Style (17th ed.) Citation

Duby, Georges. William Marshal: The Flower of Chivalry. 1st American ed. New York: Pantheon Books, 1985.

MLA (9th ed.) Citation

Duby, Georges. William Marshal: The Flower of Chivalry. 1st American ed. Pantheon Books, 1985.