APA引文

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

Chicago Style (17th ed.) Citation

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

MLA引文

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

警告：這些引文格式不一定是100％准確.