APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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