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
2013-03-06 to 2013-04-26
Falileyev, Alexander (2016). Llawlyfr Hen Gymraeg. Coleg Cymraeg Cenedlaethol. Online: https://llyfrgell.porth.ac.uk/View.aspx?id=1411~4h~GDh5Q67L
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