William Tyler
A Short Booklist for Germany 2: Religion and War (16th and 17th centuries)
Luther Eric Metaxas
Martin Luther Scott Hendrix (OUP Very Short Histories)
Emperor (Charles V) Geoffrey Parker
The Thirty Years War Richard Bonney (Osprey)
Europe's Tragedy (30 Years War) Peter Wilson
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The March of Folly (Part 3) Barbara Tuchman
Germany, Present and Past Sabine Baring-Gould (Pub 1882)
A Most Dangerous Book Christopher Krebs
(the link between Tacitus' Germania and Nazism)