^Metzger, Bruce M.; Ehrman, Bart D. The Text of the New Testament: Its Transmission, Corruption, and Restoration. New York, Oxford: Oxford University Press. 2005.
^ 2.02.1Aland, Kurt and Aland, Barbara. The Text of the New Testament: An Introduction to the Critical Editions and to the Theory and Practice of Modern Textual Criticism. Michigan: William B. Eerdmans Publishing Company. 1995: 107–108.