Michiel de Vaan. Etymological Dictionary of Latin and the other Italic Languages. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Corominas, Joan. Diccionario crítico etimológico castellano e hispánico. Obra completa. Madrid: Editorial Gredos. [Con la colaboración de José A. Pascual]. 1991-1997.
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.