Since Paul’s letter to the Romans is so central to the modern study of Paul, most of the scholarly books written about Paul for general audiences will either deal directly with it or be in part based on it. For a list of some of the best of those, see my previous post (“The Life and Letters of Paul: For Further Reading” (March 16, 2025).
I devote a full chapter to Romans in my textbook, Bart Ehrman and Hugo Mendez, The New Testament: A Historical Introduction to the Early Christian Writings, 8th ed. (Oxford University Press, 2024), ch. 21. That’s a good place to start for a fuller exposition of what I have given here in my nutshell posts. If you have an earlier edition of the book, it will be pretty much the same, except for the expanded bibliography.
Here is bibliography based on my seventh and eight editions (combined) of my book:
In addition to these, I found your book, “Peter, Paul, and Mary Magdalene” helpful for understanding Romans, especially in how Paul adapted his message for different audiences and how later traditions shaped his legacy. It makes me wonder—did Paul see these different models of salvation as fully compatible, or was he more concerned with persuasion than consistency? Thanks for the resource list!