Kloekhorst, Alwin. Etymological Dictionary of the Hittite Inherited Lexicon. http://dictionaries.brillonline.com
Cheung, Johnny (2010-). Etymological Dictionary of the Iranian Verb. Indo-European etymological dictionaries online [online]. The Netherlands: Brill.
Robert Farren, PIE culture words collection, 2017
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This map shows the etymological links in a geographic context.