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
Cornish Language Partnership online dictionary http://www.cornishdictionary.org.uk/
Geiriadur Prifysgol Cymru: A Dictionary of the Welsh Language. http://welsh-dictionary.ac.uk/gpc/gpc.html
Robert Farren, PIE culture words collection, 2017
DU63, DU67, DU69, DU73, DU75, DU77, DU79, DU81
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