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
Rick Derksen. Etymological Dictionary of the Slavic Inherited Lexicon. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
[RD]
Source
Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online: http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/content/proto-celtic/index.html
[RM]
Source
Simpson, J., & Weiner, E. S. 1989. Oxford English dictionary. Oxford: Clarendon Press.
[OED]
Source
DEX online (2004-2015). Dicționare ale limbii române. https://dexonline.ro/
[DEX]
Source
Robert Farren, PIE culture words collection, 2017
[Farren (2017)]
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Ancestry Diagram
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Map
This map shows the etymological links in a geographic context.