The Theology of Martin Luther
Don't be deceived by the title- it's not relevant only for looking at Luther. Few books are more powerful on sin.
Here I Stand: A Life of Martin Luther
Roland Bainton takes us on a rip-rorading adventure through the life of the Reformation's famous founder, Martin Luther.
Martin Luther's Basic Theological Writings
Edited by Timothy Lull
A compilation of Luther's famous works.