Cheetham, N. Keepers of the keys: A history of the Popes from St. Peter to John Paul II.
Čikaški stil citiranja (17. izdanje)Cheetham, Nicolas. Keepers of the Keys: A History of the Popes from St. Peter to John Paul II.
MLA način citiranja (8. izdanje)Cheetham, Nicolas. Keepers of the Keys: A History of the Popes from St. Peter to John Paul II.
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