APA (7 ম সংস্করণ) উদ্ধৃতি

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

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

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

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

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