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
Buck, C., D. (1949). A dictionary of selected synonyms in the principal Indo–European languages: a contribution to the history of ideas. Chicago: University of Chicago Press.
[CDB]
Source
Simpson, J., & Weiner, E. S. 1989. Oxford English dictionary. Oxford: Clarendon Press.
[OED]
Source
Cheung, Johnny (2010-). Etymological Dictionary of the Iranian Verb. Indo-European etymological dictionaries online [online]. The Netherlands: Brill.
[JC]
Source
Robert Farren, PIE culture words collection, 2017
[Farren (2017)]
Visualization
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Ancestry Diagram
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Map
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