TY  - BOOK
T1  - The Popes and Heresy in the Thirteenth Century
A1  - Shannon, Albert Clement
PP  - Villanova
PB  - Augustinian Press
YR  - 1949
UL  - http://vufind10-pruebas.sigbunlp.bibliotecas.unlp.edu.ar/Record/dun.67379
OP  - 148
ER  -