APA (7th ed.) Citation

Cornwell, J. (1999). Hitler's Pope: The secret history of Pope Pius XII. Viking.

Chicago Style (17th ed.) Citation

Cornwell, John. Hitler's Pope: The Secret History of Pope Pius XII. New York, N.Y: Viking, 1999.

MLA (8th ed.) Citation

Cornwell, John. Hitler's Pope: The Secret History of Pope Pius XII. Viking, 1999.

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