APA (7th ed.) Citation

Cahill, T. (2002). Pope John XXIII. Viking.

Chicago Style (17th ed.) Citation

Cahill, Thomas. Pope John XXIII. New York [u.a.]: Viking, 2002.

MLA (8th ed.) Citation

Cahill, Thomas. Pope John XXIII. Viking, 2002.

Warning: These citations may not always be 100% accurate.