Pastors have requested sources for the study of the 5 great "sola"s of the Reformation (the authority of Scripture alone, salvation by grace alone, through Christ alone, by grace alone, to the glory of God alone).
Helpful Books on the 5 "sola"s of the Reformation
Boice, James Montgomery. Whatever Happened to the Gospel of Grace?: Rediscovering the Doctrines that Shook the World. Wheaton, Illinois: Crossway Books, 2001.
Johnson, Terry L. The Case for Traditional Protestantism: the Solas of the Reformation. Carliasle, Pennsylvania: Banner of Truth Trust, 2004