APA (7. basım) Alıntı

Cheetham, N. Keepers of the keys: A history of the Popes from St. Peter to John Paul II.

Chicago Style (17. basım) Atıf

Cheetham, Nicolas. Keepers of the Keys: A History of the Popes from St. Peter to John Paul II.

MLA (8th ed.) Atıf

Cheetham, Nicolas. Keepers of the Keys: A History of the Popes from St. Peter to John Paul II.