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
Robert Farren, PIE culture words collection, 2017
BU11, BU13, BU15, BU19, BU21, BU23, BU25
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