APA

Kittler G. D., . (1960). The Papal Princes. A History of the Sacred College of Cardinals. New York: Nihil Obstat.

Chicago

Kittler Glenn D, . 1960. The Papal Princes. A History of the Sacred College of Cardinals. New York: Nihil Obstat.

Harvard

Kittler G. D., . (1960). The Papal Princes. A History of the Sacred College of Cardinals. New York: Nihil Obstat.

MLA

Kittler Glenn D, . The Papal Princes. A History of the Sacred College of Cardinals. New York: Nihil Obstat. 1960.