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1 2 3 Fisher, Richard S. (1852). The book of the world: Vol.2. New York.
↑ Rindler Schjerve, Rosita (2003). Diglossia and Power. Berlin.
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↑ Förster, Ernst (1866). Handbuch für Reisende in Italien: Vol.1. Munich.
↑ name=Schjerve>Rosita Rindler Schjerve (2003) "Diglossia and Power: Language Policies and Practice in the 19th Century Habsburg Empire", ISBN 3-11-017653-X, pp. 199-200
