Catholic Apologists are doing a great job pounding away at the Reformation cornerstones. Of particular interest to me is the doctrine of Sola Scriptura, that Scripture is the standard of authority for the churches, and that everything that is necessary to salvation is contained in the pages of Holy Writ.
Many of the Protestant Pastors who have converted to Catholicism have done so because they believe there must be some extra-biblical authority (Tradition and the Teaching Magisterium of the Catholic Church) to explain what Scripture means.
So here are some important books to help you understand Sola Scriptura. Methodists particularly need to work hard to hold on to this doctrine.
Holy Scripture: The Ground and Pillar of our Faith, vol. 1 by David King: A Biblical Defense of the Reformation Principle of Sola Scriptura published 2001 by Christian Resources
Holy Scripture: The Ground and Pillar of our Faith, vol.2 : An Historical Defense of the Reformation Principle of Sola Scriptura, by William Webster published 2001, by Christian Resources
Holy Scripture: The Ground and Pillar of our Faith, vol. 3: The Writings of the Church Fathers Affirming the Reformation Principle of Sola Scriptura, eds. David King and William Webster published 2001, Christian Resources
Disputations on Holy Scripture, William Whitaker (Whitaker's treatise against Robert Bellarmine) from 1588. Republished by Soli Deo Gloria