Feuchtwanger, E. J. (1970). Prussia: Myth and Reality. The Role of Prussia in German History. Londres: Wolff
Kruse, Paul (1958). The Story of the Encyclopaedia Britannica, 1768-1943. Chicago: Departamento de Fotoduplicação, Biblioteca da Universidade de Chicago
Norman, Gertrude; Maxse, Reginald (1910). A Brief History of Bavaria. Munique: English and American BookA referência emprega parâmetros obsoletos |coautor= (ajuda)
Wyatt, Walter James (1876). The History of Prussia: From the Earliest Times to the Present Day: Tracing the Origin and Development of Her Military Organization. A.D. 1390-1525. Londres: Longmans, Green and Company