Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
De Vries, Jan (1977). Altnordisches etymologisches Wörterbuch. 3rd ed. Leiden: Brill
Simpson, J., & Weiner, E. S. 1989. Oxford English dictionary. Oxford: Clarendon Press.
Young, George Vaughan Chichester & Clewer, Cynthia R. (1985). Føroysk-Ensk ordabók: Faroese-English dictionary: with Faroese folk-lore and proverbs: and a section by WB Lockwood on Faroese pronunciation. Peel, Isle of Man: Mansk-Svenska Publ. Co.
Robert Farren, PIE culture words collection, 2017
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This map shows the etymological links in a geographic context.