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: Augustinian Press, 1949.
Cita MLA (9a ed.)Shannon, Albert Clement. The Popes and Heresy in the Thirteenth Century. Augustinian Press, 1949.
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