APA-ийн эшлэл(7 дахь хэвлэлт)

Cheetham, N. (1982). Keepers of the keys: A history of the popes from St. Peter to John Paul ll. Charles Scribner's.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

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 -ийн эшлэл (9 дэх хэвлэлт)

Cheetham, Nicholas. Keepers of the Keys: A History of the Popes from St. Peter to John Paul Ll. Charles Scribner's, 1982.