ENCACLOPEDIA AMERICANA, Vol. 9, 1904:
MEYERS Großes Konversations-Lexikon, Band 11. Leipzig 1907, S. 621.:
ENCYCLOPÆDIA BRITANNICA, 11. Aufl., Vol. VII, S. 401, 1910:
FUNK & WAGNALLS Standard Encyclopedia of the World´s Knowledge, Vol XV, S. 366, 1912:
THE NEW INTERNATIONAL ENCACLOPÆDIA, 2nd. Ed., Vol. VIII, S. 365, 1915:
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