Blažek, Václav (2009). ”On the position of Gaulish within Celtic from the point of view of glottochronology”, Indogermanische Forschungen. 114. Berlin: de Gruyter
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
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This map shows the etymological links in a geographic context.