APA (7th ed.) Citation

Cowdrey, H. E. J. (1994). Popes, monks and crusaders. The Hambledon Press.

Chicago Style (17th ed.) Citation

Cowdrey, H. E. J. Popes, Monks and Crusaders. London: The Hambledon Press, 1994.

MLA (9th ed.) Citation

Cowdrey, H. E. J. Popes, Monks and Crusaders. The Hambledon Press, 1994.