Buck, C., D. (1949). A dictionary of selected synonyms in the principal Indo–European languages: a contribution to the history of ideas. Chicago: University of Chicago Press.
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
Simpson, J., & Weiner, E. S. 1989. Oxford English dictionary. Oxford: Clarendon Press.
Griffiths, Bruce & Dafydd Glyn Jones. Geiriadur yr Academi, the Welsh Academy English-Welsh Dictionary Online. http://geiriaduracademi.org/?lang=en
Ó Dónaill, Niall & De Bhaldraithe, Tomás (red.) (1977). Foclóir Gaeilge-Béarla. Baile Átha Cliath: An Rún.
Robert Farren, PIE culture words collection, 2017
AOF47, AOF59, AOF67
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This map shows the etymological links in a geographic context.