APA (7th ed.) Citation

Cowdrey, H. E. J. (1998). Pope Gregory VII, 1073-1085. Clarendon Press ; Oxford University Press.

Chicago Style (17th ed.) Citation

Cowdrey, H. E. J. Pope Gregory VII, 1073-1085. Oxford : Oxford ; New York: Clarendon Press ; Oxford University Press, 1998.

MLA (9th ed.) Citation

Cowdrey, H. E. J. Pope Gregory VII, 1073-1085. Clarendon Press ; Oxford University Press, 1998.