Dudenredaktion; Kleiner, Stefan; Knöbl, Ralf (2015) [First published 1962]. Das Aussprachewörterbuch [The Pronunciation Dictionary] (in German) (7th ed.). Berlin: Dudenverlag. pp. 435, 557. 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. 575, 703. ISBN978-3-11-018202-6.
FC Basel 1893 (8 September 2020). "Der FCB verpflichtet Heinz Lindner". FCB signed Heinz Lindner (in German). FC Basel 1893 AG. Retrieved 8 September 2020.{{cite web}}: CS1 maint: numeric names: authors list (link)