* 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, pp.
* 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, pp.