1) Who’s Who in the Reformation:
http://catholiceducation.org/articles/history/world/wh0050.html

2) Catholic Encyclopedia:
http://www.newadvent.org/cathen/12700b.htm

3) Why Only Catholicism Can Make Protestantism Work: Louis Bouyer on the Reformation:
http://www.catholiceducation.org/articles/apologetics/ap0097.html

4) History of the Reformation:
http://www.ourcatholicfaith.org/reformation.html