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Danielou, Jean and Henri Marrou. The Christian Centuries Vol. I: The First Six Hundred Years. McGraw-Hill Book Company, New York, 1964.
Davies, J.G. The Early Christian Church. Holt, Rinehart and Winston, New York, 1965.
Schaff, Philip. History of the Christian Church Vol. II: Ante-Nicene Christianity. Charles Scribner's Sons, New York, 1918.