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
Corominas, Joan. Diccionario crítico etimológico castellano e hispánico. Obra completa. Madrid: Editorial Gredos. [Con la colaboración de José A. Pascual]. 1991-1997.
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