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
Griffiths, Bruce & Dafydd Glyn Jones. Geiriadur yr Academi, the Welsh Academy English-Welsh Dictionary Online. http://geiriaduracademi.org/?lang=en
Cornish Language Partnership online dictionary http://www.cornishdictionary.org.uk/
Robert Farren, PIE culture words collection, 2017
AKK63, AKK67, AKK69, AKK79, AKK83
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