«Friedrich III». Archontology. Consultado em 17 de setembro de 2014
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Dorpalen 1948, p. 1 Dorpalen, Andreas (1948). «Emperor Frederick III and the German Liberal Movement». American Historical Association. The American Historical Review. 54 (1): 1–31. doi:10.2307/1841754
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Dorpalen 1948, p. 31 Dorpalen, Andreas (1948). «Emperor Frederick III and the German Liberal Movement». American Historical Association. The American Historical Review. 54 (1): 1–31. doi:10.2307/1841754
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