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.
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.
Nocentini, Alberto (2010). L'etimologico: vocabolario della lingua italiana. 1. ed. Milano: Le Monnier
Robert Farren, PIE culture words collection, 2017
Rubattu, Antoninu (2001-2003). Dizionario universale della lingua di Sardegna: italiano-sardo-italiano, antico e moderno : con i corrispondenti in inglese, francese, spagnolo, tedesco. Sassari: EDES
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This map shows the etymological links in a geographic context.