An Stòr-dàta Briathrachais Gàidhlig: http://www2.smo.uhi.ac.uk/gaidhlig/faclair/sbg/lorg.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
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
KX59, KX61, KX63
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