Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Steensland, Lars (2010). Material till en älvdalsk ordbok: svenska-älvdalska, älvdalska-svenska. Älvdalen: Ulum dalska
De Vries, Jan (1977). Altnordisches etymologisches Wörterbuch. 3rd ed. Leiden: Brill
Robert Farren, PIE culture words collection, 2017
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This map shows the etymological links in a geographic context.