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.
Simpson, J., & Weiner, E. S. 1989. Oxford English dictionary. Oxford: Clarendon Press.
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
AJL49, AJL59, AJL61
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This map shows the etymological links in a geographic context.