APA (7th ed.) Citation

Powell, J. M. (1963). Innocent III: Vicar of Christ of lord of the world? D.C. Heath.

Chicago Style (17th ed.) Citation

Powell, James M. Innocent III: Vicar of Christ of Lord of the World? Boston: D.C. Heath, 1963.

MLA (8th ed.) Citation

Powell, James M. Innocent III: Vicar of Christ of Lord of the World? D.C. Heath, 1963.

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