Jabarkan Catatan dari Perjanjian Lateran

Riccards, Michael P. 1998. Vicars of Christ: Popes, Power, and Politics in the Modern World. Herder & Herder. ISBN 0-8245-1694-X.

Zuccotti, Susan. 2000. Under His Very Windows: The Vatican and the Holocaust in Italy. Yale University Press. ISBN 0-300-09310-1.