An Stòr-dàta Briathrachais Gàidhlig: http://www2.smo.uhi.ac.uk/gaidhlig/faclair/sbg/lorg.php
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.
Dictionary of the Irish language: based mainly on old and middle Irish materials. (1913-1976). Dublin: Royal Irish Academy. Online at: http://edil.qub.ac.uk/dictionary/search.php
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
Dinneen, Patrick S. 1904. Foclóir Gaedhilge agus Béarla: An Irish-English dictionary. Dublin: M. H. Gill & Son, Ltd.
Robert Farren, PIE culture words collection, 2017
V59, V59, V61, V61, V63, V67, V69, V73, V73
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This map shows the etymological links in a geographic context.