Here are three books that would be nice to add to the library:
Martin Luther Road to Reformation, Vol 1;
http://www.amazon.com/Martin-Luther-Road-Reformation-1483-1521/dp/0800628136/ref=sr_1_1?s=books&ie=UTF8&qid=1391229149&sr=1-1
Shaping and Defining the Reformation, Vol. 2;
http://www.amazon.com/Martin-Luther-1521-1532-Defining-Reformation/dp/0800628144/ref=pd_bxgy_b_img_y
The Preservation of the Church, Vol. 3;
http://www.amazon.com/Martin-Luther-Preservation-Church-1532-1546/dp/0800628152/ref=pd_bxgy_b_img_z
