Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
2013-03-06 to 2013-04-26
Schützeichel, Rudolf (2012). Althochdeutsches Wörterbuch. 7th edn. Tübingen: Max Niemeyer Verlag
Kluge, Friedrich (1960). Etymologisches Wörterbuch der Deutschen Sprache. 18. Auflage. Berlin: Walter De Gruyter & Co.
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This map shows the etymological links in a geographic context.