Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Bibliographisches Institut GmbH (2013). Duden Die deutsche Rechtschreibung [online]. Available at: http://www.duden.de/
Robert Farren, PIE culture words collection, 2017
FY29, FY31, LO29, LO31
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