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Bart D. Ehrman, "The Orthodox Corruption of Scripture. The Effect of Early Christological Controversies on the Text of the New Testament", Oxford University Press, New York – Oxford, 1996, pp. 223–227.

Bruce M. Metzger, "A Textual Commentary on the Greek New Testament: A Companion Volume to the United Bible Societies' Greek New Testament", 1994, United Bible Societies, London & New York.