APA (7th ed.) Citation

Oldenbourg, Z. (1966). The crusades. Pantheon Books.

Chicago Style (17th ed.) Citation

Oldenbourg, Zoé. The Crusades. New York: Pantheon Books, 1966.

MLA (9th ed.) Citation

Oldenbourg, Zoé. The Crusades. Pantheon Books, 1966.

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