APA (7th ed.) Citation

Somerville, R. (2011). Pope Urban II's Council of Piacenza. Oxford University Press.

Chicago Style (17th ed.) Citation

Somerville, Robert. Pope Urban II's Council of Piacenza. Oxford: Oxford University Press, 2011.

MLA (9th ed.) Citation

Somerville, Robert. Pope Urban II's Council of Piacenza. Oxford University Press, 2011.

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