Here's my partial list of those sources I've found most useful in dealing with Roman Catholicism. Rather than post as many sources as possible, I've picked only those that have been the most helpful to me over the years, and those that are typically layman friendly. It's often not the number of sources one has, it's their clarity and usefulness.
I've included some audio debates and lectures as well. Picking audio choices is unfortunately like counting sand.
It should go without saying that I've been heavily influenced by the work of Dr. James White (as this list will show), particularly his many live debates and Dividing Line broadcasts. I've been listening to Dr. White's shows, sermons, lectures, and debates on Roman Catholicism since somewhere around 1998-1999.
R.C. Sproul, Roman Catholicism (audio series)
James White, The Roman Catholic Controversy
Eric Svendsen, Evangelical Answers, A Critique of Current Roman Catholic Apologists
Eric Svendsen, Upon This Slippery Rock: Countering Roman Catholic Claims to Authority
William Webster, The Church of Rome at the Bar of History
William Webster, Roman Catholic Tradition: Claims and Contradictions
William Webster, Roman Catholic Tradition: It's Roots and Evolution (mp3 lectures)
James White, Are Roman Catholics Our Brothers and Sisters in Christ? (debate against Doug Wilson)
James White, From The Bible Answer Man: Discussion with Tim Staples
Various, The Conference On Rome
David King, Holy Scripture: The Ground and Pillar of Our Faith, Volume I: A Biblical Defense of the Reformation Principle of Sola Scriptura
William Webster, Holy Scripture: The Ground and Pillar of Our Faith, Volume II: An Historical Defense of the Reformation Principle of Sola Scriptura
David King and William Webster, Holy Scripture: The Ground and Pillar of Our Faith, Volume III: The Writings of the Church Fathers Affirming the Reformation Principle of Sola Scriptura.
B.B. Warfield, The Inspiration and Authority of the Bible
William Whitaker, Disputations of Holy Scripture
James R. White, Scripture Alone, Exploring the Bible's Accuracy, Authority, and Authenticity
James White, Does the Bible Teach Sola Scriptura? (vs. Patrick Madrid)
R.C. Sproul, Faith Alone: The Evangelical Doctrine of Justification
James White, The God Who Justifies, The Doctrine of Justification
Alister McGrath, Iustitia Dei, A History of the Christian Doctrine of Justification(Third Edition).
Louis Berkhof, Systematic Theology (New Combined Edition). See Part Four: The Doctrine of the Application of the Work of Redemption, pp. 415-554.
James White, Is the Mass a Propitiatory Sacrifice?
James White, By Faith Alone (vs. Matatics)
Jacques Le Goff, The Birth of Purgatory
James White, Purgatory: Biblical or Mythical? (White vs Stravinskas)
James White, 1 Corinthians 3 and Tim Staples
Mary and the Saints
Giovanni Miegge, The Virgin Mary
James White, Mary Another Redeemer
Eric Svendsen, Who Is My Mother? The Role and Status of the Mother of Jesus
James White, Did Mary Have Other Children?
James White, The Immaculate Conception Debate
James White, Veneration of Saints and Images (White vs Madrid)
Jean Daillé, A treatise concerning the right use of the Fathers, in the decision of the controversies that are this day in religion
J.N.D. Kelly, Early Christian Doctrines
James White, Is The Roman Catholic Priesthood Biblical and Ancient? (vs. Pacwa)
Greg Bahnsen, The Concept and Importance of Canonicity
Greg Bahnsen, Question of Canonicity (mp3 lecture)
Roger Beckwith, The Old Testament Canon of the New Testament Church: And Its Background in Early Judaism
F.F. Bruce, The Canon of Scripture
James White, Is The Apocrypha Scripture? (White vs Michuta)
J.N.D. Kelly, The Oxford Dictionary of Popes
William Webster, The Matthew 16 Controversy: Peter and the Rock
James White, How Biblical and Ancient is the Papacy?
James White, Was Peter a Pope?