Lübben, August (1888). Mittelniederdeutsches Handwörterbuch. Norden: Soltau
Simpson, J., & Weiner, E. S. 1989. Oxford English dictionary. Oxford: Clarendon Press.
Bibliographisches Institut GmbH (2013). Duden Die deutsche Rechtschreibung [online]. Available at: http://www.duden.de/
Robert Farren, PIE culture words collection, 2017
NK13, NK29, NK31
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This map shows the etymological links in a geographic context.