APA (7th ed.) Citation

Shannon, A. C. (1949). The popes and heresy in the thirteenth century. Augustinian Press.

Chicago Style (17th ed.) Citation

Shannon, Albert C. The Popes and Heresy in the Thirteenth Century. Villanova: Augustinian Press, 1949.

MLA (8th ed.) Citation

Shannon, Albert C. The Popes and Heresy in the Thirteenth Century. Augustinian Press, 1949.

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