Lübben, August (1888). Mittelniederdeutsches Handwörterbuch. Norden: Soltau
Simpson, J., & Weiner, E. S. 1989. Oxford English dictionary. Oxford: Clarendon Press.
Robert Farren, PIE culture words collection, 2017
NK13, NK15, NK17, NK19, NK21, NK39
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When the etymological tree is displayed in hierarchical style, the nodes can be repositioned manually only within their level.
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This map shows the etymological links in a geographic context.