APA (7e ed.) Bronvermelding
Cheetham, N. (1982). Keepers of the keys: A history of the popes from St. Peter to John Paul ll. Charles Scribner's.
Chicago (17e ed.) Bronvermelding
Cheetham, Nicholas. Keepers of the Keys: A History of the Popes from St. Peter to John Paul Ll. New York: Charles Scribner's, 1982.
MLA (9e ed.) Bronvermelding
Cheetham, Nicholas. Keepers of the Keys: A History of the Popes from St. Peter to John Paul Ll. Charles Scribner's, 1982.
Let op: Deze citaties zijn niet altijd 100% accuraat.