Gutmann, Myron P. (1988). "The Origins of the Thirty Years War". Journal of Interdisciplinary History. 18 (4): 764–765. doi:10.2307/204823. JSTOR204823.
Gutmann, Myron P. (1988). "The Origins of the Thirty Years War". Journal of Interdisciplinary History. 18 (4): 764–765. doi:10.2307/204823. JSTOR204823.