Here are some works I've consulted.
Alan F. Johnson, “A Stylistic Trait of the Fourth Gospel in the Pericope Adulterae?” in Bulletin of the Evangelical Theological Society 9, No. 2 (1966)
Bart D. Ehrman, “Jesus and the Adulteress” in New Testament Studies 34 (1988)
Bruce M. Metzger, A Textual Commentary on the Greek New Testament (Stuttgart: Deutsche Bibelgesellschaft, 1997)
Bruce M. Metzger, The Text of the New Testament: Its Transmission, Corruption, and Restoration, 3rd Enlarged Edition (New York: Oxford University Press, 1992)
David Alan Black, New Testament Textual Criticism: A Concise Guide (Grand Rapids: Baker Book House, 1994)
Ernest C. Colwell, Studies in Methodology in Textual Criticism of the New Testament (Leiden: E.J. Brill, 1969)
Gordon H. Clark, Logical Criticisms of Textual Criticism, 2nd ed. (Unicoi: Trinity Foundation, 1990)
J. Harold Greenlee, Introduction to New Testament Textual Criticism, Revised Edition (Grand Rapids: Baker Academic, 1995)
Wilbur N. Pickering, The Identity of the New Testament Text (Nashville: Thomas Nelson, Inc., 1977)
Of those, I think David Alan Black gives the most neutral overview. Wilbur Pickering questions the current consensus on the approach to textual criticism, but the information provided in the others doesn't always seem to support the consensus approach very forcefully. Greenlee is probably the 2nd most painfully boring book I have ever read. I think Upper Cretaceous Limestone in the Lone Star State would be a positive cliffhanger in comparison. The Clark book didn't set out to accomplish much, and succeeded rather well, I thought.