Allan R. Bomhard. Reconstructing Proto-Nostratic, Comparative Phonology, Morphology, and Vocabulary. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
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
WS29, WS31, WS33
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