Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online: http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/content/proto-celtic/index.html
Houaiss, Antônio & MS Villar. 2001. Dicionário Houaiss da língua portuguesa. Rio de Janeiro: Instituto António Houaiss.
Trésors de la langue francaise informatisées. Centre national de ressources techniques et lexiques. http://www.cnrtl.fr/definition/
Robert Farren, PIE culture words collection, 2017
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This map shows the etymological links in a geographic context.