Cita APA (7a ed.)

Powell, J. M. (1995). Innocent III: Vicar of Christ or lord of the world? (2nd expanded ed.). Catholic University of America Press.

Cita Chicago Style (17a ed.)

Powell, James M. Innocent III: Vicar of Christ or Lord of the World? 2nd expanded ed. Washington: Catholic University of America Press, 1995.

Cita MLA (9a ed.)

Powell, James M. Innocent III: Vicar of Christ or Lord of the World? 2nd expanded ed. Catholic University of America Press, 1995.