Adams, Douglas Q. (2013). Etymological Dictionary of Tocharian B. Revised and Greatly Enlarged. Amsterdam - Atlanta: Rodopi.
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.
Robert Farren, PIE culture words collection, 2017
AQD181, AQD183, AQD185, AQE181
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This map shows the etymological links in a geographic context.