Style de citation APA

Egger, C., Gregorius Papa, I., & Innocentius Papa, I. (2004). The growling of the lion and the humming of the fly: Gregory the Great and Innocent III. Pope, church and city, 13.

Style de citation Chicago

Egger, Christoph, I. Gregorius Papa, et III Innocentius Papa. "The Growling of the Lion and the Humming of the Fly: Gregory the Great and Innocent III." Pope, Church and City 2004: 13.

Style de citation MLA

Egger, Christoph, et al. "The Growling of the Lion and the Humming of the Fly: Gregory the Great and Innocent III." Pope, Church and City, 2004, p. 13.