APA (7th ed.) Citation

Robinson, I. S. (1990). The papacy, 1073-1198: Continuity and innovation. Cambridge University Press.

Chicago Style (17th ed.) Citation

Robinson, I. S. The Papacy, 1073-1198: Continuity and Innovation. Cambridge [England] ; New York: Cambridge University Press, 1990.

MLA (9th ed.) Citation

Robinson, I. S. The Papacy, 1073-1198: Continuity and Innovation. Cambridge University Press, 1990.