Michiel de Vaan. Etymological Dictionary of Latin and the other Italic Languages. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Kluge Friedrich. 1883. Etymologisches Wörterbuch der deutschen Sprache
Robert Farren, PIE culture words collection, 2017
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This map shows the etymological links in a geographic context.