Michiel de Vaan. Etymological Dictionary of Latin and the other Italic Languages. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Galimberti Jarman, Beatriz, Russell, Roy, Carvajal, Carol Styles & Horwood, Jane (red.) (2003). The Oxford Spanish dictionary: Spanish-English/English-Spanish. 3. ed. Oxford: Oxford U.P.
DEX online (2004-2015). Dicționare ale limbii române. https://dexonline.ro/
Robert Farren, PIE culture words collection, 2017
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This map shows the etymological links in a geographic context.