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, 13-46.
Παραπομπή σε μορφή Chicago (17η εκδ.)Egger, Christoph, I. Gregorius Papa, και 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: 13-46.
Παραπομπή σε μορφή MLA (9th εκδ.)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, pp. 13-46.
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