Rick Derksen. Etymological Dictionary of the Slavic Inherited Lexicon. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Lübben, August (1888). Mittelniederdeutsches Handwörterbuch. Norden: Soltau
Robert Farren, PIE culture words collection, 2017
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