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.
[RB]
Source
Kloekhorst, Alwin. Etymological Dictionary of the Hittite Inherited Lexicon. http://dictionaries.brillonline.com
[AK]
Etymology
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Ancestry Diagram
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Map
This map shows the etymological links in a geographic context.