APA (7th ed.) Citation

Ambroise, a. a. 1. (1976). The crusade of Richard Lion-Heart. Octagon Books.

Chicago Style (17th ed.) Citation

Ambroise, active approximately 1196. The Crusade of Richard Lion-Heart. New York: Octagon Books, 1976.

MLA (9th ed.) Citation

Ambroise, active approximately 1196. The Crusade of Richard Lion-Heart. Octagon Books, 1976.