Michiel de Vaan. Etymological Dictionary of Latin and the other Italic Languages. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Houaiss, Antônio & MS Villar. 2001. Dicionário Houaiss da língua portuguesa. Rio de Janeiro: Instituto António Houaiss.
Nocentini, Alberto (2010). L'etimologico: vocabolario della lingua italiana. 1. ed. Milano: Le Monnier
Robert Farren, PIE culture words collection, 2017
AGT93, AGT93, AHO93
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