Tree: "Also, if you could recommend a good book or scholarly article, perhaps from a Catholic perspective, which seeks to argue against Sola Scriptura, I would appreciate it!"
I speak as a former Theology professor who has served as an advisor on several research papers and some Masters and Doctoral theses. Your topic is far too general and complex for one research paper. So your project needs a manageable focus.
Consider these 2 examples of a more limited focus:
(1) You might employ a historical focus on John Wesley and his so-called "Wesjeyan Quadrilateral"--the Authority of Scripture, Tradition, Reason, and Experience;
(2) Or you might examine Clark Pinnock's reasons for changing his mind on your issue. Pinnock wrote a highly touted book on biblical authority and inerrancy, only to later renounce this belief in later publications.
Tree: "My basic thesis will be something like: "The Bible teaches the doctrine of Sola Scriptura and therefore we should accept it." In order to do a bang-up job I need to confront and dispatch the most formidable objections to the doctrine. What objections are you aware of?"
(1) General Revelation
(1) Progressive Revelation:
This issue is so complex that if you focus on it at all, it must be the focus of your entire paper. Let me give you just 3 of the many thorny facets of this problem:
(a) As the New Lawgiver in the Sermon on the Mount, Jesus frequently negates OT teaching rather than simply bringing it to fulfillment. For example, contrast both Jesus' prohibition on divorce with the Pentateuch's easy access to divorce for men and Jesus' teaching on love for enemies and nonretaliation with the OT approval of retialiation and the desire for vengeance.
(b) Consider the fact that, apart from Daniel 12:1-3, most of the OT rejects the doctrine of postmortem survival. "Sheol" is often mistranslated Hell and cannot be deemed a realm of fully conscious postmortem survival.
(c) At times Paul distinguishes his own "opinion" from God's commands (e. g. in 1
Corinthians 7:25), thus raising the question of the line between opinion and revelation in Paul and the rest of Scripture.
(d) In 1 Corinthians Paul insists the women cover their heads for public worship (11:5) and commands believers to greet one another with a holy kiss (16:20)." Modern Christians treat such perspectives as culturally biased practices that can be safely ignored and in so doing raise the question of the elusive line between culturally obsolescent principles and binding divine revelation. Progressive Christians dismiss biblical prohibitions against homosexual sex acts as culturally obsolete rules. They justify this on the grounds (i) that the Bible knows nothing of a natural gay orientation and (ii) that the Bible never considers the possibility of 2 men genuinely loving each other with loving sexual attraction. The line between cultural bias and authoritative revelation cannot be determined solely on the basis of prooftexting. Reason and church tradition must also be invoked.
(e) Similarly, reason and church tradition must be invoked to address the tacit approval of slavery in much of Scripture and the failure of Scripture to explicitly condemn abortion.
(f) Jesus teaches that the Holy Spirit will teach His followers "many things" after Jesus' departure and that the church is therefore better off without His physical presence, so that this revelation from the Spirit can be activated (John 16:7, 12). The implication of the Spirit's permanent revelatory role implies the doctrine of progressive revelation and cannot be limited to our canonical NT.
(2) Canonical uncertainty:
The doctrine of Sola Scripture must address the thorny question of which books can treated as Scripture. Jude alludes to 1 Enoch and the Assumption of Moses as authoritative sources for revelation. Paul quotes the Apocalypse of Elijoh as authortive Scripture (see 1 Corinthians 2:9). More importantly, you must address the question of why the Catholic Apocrypha, basically the extra books in the Greek Old Testament (the Septuagint), should be rejected in favor of the Pharisee/ historian Josephus's version of the OT that Protestants accept. In considering this question, you must address the use of the Septuagint in our New Testament (e. g. in Matthew), a use that seems to imply an acceptance of the OT Apocrypha.
(3) Your must address the most basic objection to Sola Scriptura: the Bible cannot and does not comment on its own divine inspiration. Not only do the NT statements about biblical inspiration not claim inerrancy; they refer only to OT inspiration, without making clear the limits of the inspired OT canon. Thus, these 2 questions demand answers:
(a) On what basis can we accept these NT claims about OT inspiration without begging the question by merely assuming the inspiration of our NT canonical books?
(4) Objection (4b) leads immediately to a another twofold objection.
(a) Paul and Peter's epistles were included in the canon on the basis of their authenticity. But the modern scholarly consensus is that Paul never wrote the Pastoral Epistles (1-2 Timothy and Titus), Ephesians and Colossians. The scholarly consensus is that Peter never wrote 2 Peter. These claims of pseudonymity are based on divergent theology, but mostly on radical differences of Greek style. Hebrews was included in the NT canon because of the erroneous belief that it was written by Paul.
(b) Even apart from all these problems is the tacit acceptance of the authority of Catholic church tradition to determine which books should be included and excluded in our NT canon.
(5) General Revelation:
It is arrogant to assume without careful investigation that pagans have no spiritual insights to teach us. There is no basis for claiming that no revelatory insights can be gained from general revelation that are not explicity taught in Scripture.
(6) The many contradictions and other errors (e. g. both historical and scientific) in the Bible:
It is naïve to claim that biblical errors are few and minor. Those who make this claim just haven't spent the many years of academic study on Scripture that I have. I will just add that I went to seminary and proceeded to a doctorate in Scripture with the goal of defending the traditional evangelic high view of Scripture. My slow (too slow!) acknowledgement that this conservative view is woefully false created one of my life's most painful crises. I had to decide that, above all, God wants me to be intellectually honest, no matter what the cost. I'm appalled by how intellectually dishonest Christians leaders are on this question, even lying about college or seminary conservative statements of faith to gain secure employment.