E.Fulton, Catholic Belief and Survival in Late Sixteenth-century Vienna: The Case of Georg Eder (1523–1587) (Aldershot, 2007), Ch. 1; M.A.Chisholm, “The Religionspolitik of Emperor Ferdinand I (1521–1564): Tyrol and the Holy Roman Empire”, European History Quarterly, 38 (2008), 551–577, at 561–565.
