Cheetham, N. Keepers of the keys: A history of the Popes from St. Peter to John Paul II.
Chicago Style (17th ed.) CitationCheetham, Nicolas. Keepers of the Keys: A History of the Popes from St. Peter to John Paul II.
MLA (8th ed.) CitationCheetham, Nicolas. Keepers of the Keys: A History of the Popes from St. Peter to John Paul II.
Warning: These citations may not always be 100% accurate.