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.
DEX online (2004-2015). Dicționare ale limbii române. https://dexonline.ro/
Nocentini, Alberto (2010). L'etimologico: vocabolario della lingua italiana. 1. ed. Milano: Le Monnier
Robert Farren, PIE culture words collection, 2017
ACM87, ACM89, ACM103
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This map shows the etymological links in a geographic context.