APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Cowdrey, Herbert Edward John. Pope Gregory VII: 1073 - 1085. Oxford: Clarendon Press, 1998.

MLA (9th ed.) Citation

Cowdrey, Herbert Edward John. Pope Gregory VII: 1073 - 1085. Clarendon Press, 1998.

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