Dudenredaktion; Kleiner, Stefan; Knöbl, Ralf (2015) [First published 1962]. Das Aussprachewörterbuch [The Pronunciation Dictionary] (in German) (7th ed.). Berlin: Dudenverlag. pp. 367, 566. ISBN978-3-411-04067-4.
Krech, Eva-Maria; Stock, Eberhard; Hirschfeld, Ursula; Anders, Lutz Christian (2009). Deutsches Aussprachewörterbuch [German Pronunciation Dictionary] (in German). Berlin: Walter de Gruyter. pp. 507, 711. ISBN978-3-11-018202-6.
Mikhail A. Kurtov (2019). ""Whence the Means?" Ludwig Feuerbach and the Origin of Media Theory". Russian Studies in Philosophy. 57 (2): 128–154. doi:10.1080/10611967.2019.1628570. S2CID210578658.
Mikhail A. Kurtov (2019). ""Whence the Means?" Ludwig Feuerbach and the Origin of Media Theory". Russian Studies in Philosophy. 57 (2): 128–154. doi:10.1080/10611967.2019.1628570. S2CID210578658.