Guignebert, C. (1962). The early history of Christianity: Covering the period from 300 B.C. to the origin of the Papacy. New York: Twayne.

Guignebert, Charles. The Early History of Christianity: Covering the Period From 300 B.C. to the Origin of the Papacy. New York: Twayne, 1962.

Guignebert, Charles. The Early History of Christianity: Covering the Period From 300 B.C. to the Origin of the Papacy. New York: Twayne, 1962.