APA (7th ed.) Citation

Zacour, N. P. (1985). A history of the crusades. A history of the crusades.

Chicago Style (17th ed.) Citation

Zacour, Norman P. "A History of the Crusades." A History of the Crusades 1985.

MLA (8th ed.) Citation

Zacour, Norman P. "A History of the Crusades." A History of the Crusades, 1985.

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