Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Instituut voor Nederlandse Lexicologie (2007-2010). De Geïntegreerde Taalbank [online]. Available at: http://gtb.inl.nl/
Robert Farren, PIE culture words collection, 2017
AOE29, AOE31, AOE33, AOE43
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