Jabarkan 1 Yohanes 5:7b-8a dari Varian tekstual dalam Surat 1 Yohanes

Varian tekstual dalam Perjanjian Baru

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.