↑ Oechsli, Wilhelm (1922). G. W. Protbero (ed.). History of Switzerland, 1499-1914. Cambridge historical series. Translated by Eden Paul; Cedar Paul. Cambridge University Press. pp.439–446.
↑ Trebein, Bertha Eleanor (1916). Theodor Fontane as a critic of the drama. Columbia University Germanic studies. Columbia University Press. p.19.
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