APA (7th ed.) Citation

Nicholson, H. J. (2004). The Crusades (1. publ.). Greenwood Press.

Chicago Style (17th ed.) Citation

Nicholson, Helen J. The Crusades. 1. publ. Westport, Conn: Greenwood Press, 2004.

MLA (9th ed.) Citation

Nicholson, Helen J. The Crusades. 1. publ. Greenwood Press, 2004.