Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Sehrt, Edward H. (1925). Vollständiges Wörterbuch zum Heliand und zur altsächsischen Genesis. Göttingen: Vandenhoeck & Ruprecht
Robert Farren, PIE culture words collection, 2017
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This map shows the etymological links in a geographic context.