Robert Beekes (with the assistance of Lucien van Beek). Etymological Dictionary of Greek. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Kloekhorst, Alwin. Etymological Dictionary of the Hittite Inherited Lexicon. http://dictionaries.brillonline.com
Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Ringe, D., Warnow, T. & Taylor, A (2002). IndoEuropean and computational cladistics. Trans. Philol. Soc. 100, 59−129
[Ringe, Warnow & Taylor (2002)]
Robert Farren, PIE culture words collection, 2017
db-43368, AQD181, AQE181, ASN181
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When the etymological tree is displayed in hierarchical style, the nodes can be repositioned manually only within their level.
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This map shows the etymological links in a geographic context.