Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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