Michiel de Vaan. Etymological Dictionary of Latin and the other Italic Languages. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Nocentini, Alberto (2010). L'etimologico: vocabolario della lingua italiana. 1. ed. Milano: Le Monnier
Robert Farren, PIE culture words collection, 2017
QL67, QL87, QL123
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This map shows the etymological links in a geographic context.