Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Lübben, August (1888). Mittelniederdeutsches Handwörterbuch. Norden: Soltau
De Vries, Jan (1977). Altnordisches etymologisches Wörterbuch. 3rd ed. Leiden: Brill
Simpson, J., & Weiner, E. S. 1989. Oxford English dictionary. Oxford: Clarendon Press.
Robert Farren, PIE culture words collection, 2017
AJK39, AJK41, AJK43, AJK45
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