* Bruce M. Metzger and Bart D. Ehrman, "The Text of the New Testament: Its Transmission, Corruption, and Restoration" (4th edition, 2005), Oxford University Press, ISBN 0-19-507297-9, p. 310–312.
* Bruce M. Metzger, Bart D. Ehrman, "The Text of the New Testament: Its Transmission, Corruption, and Restoration" (4th edition, 2005), Oxford University Press, ISBN 0-19-507297-9, p. 310–312.