An Stòr-dàta Briathrachais Gàidhlig: http://www2.smo.uhi.ac.uk/gaidhlig/faclair/sbg/lorg.php
Robert Farren, PIE culture words collection, 2017
MacLennan, Malcolm (1979). A pronouncing and etymological dictionary of the Gaelic language: Gaelic-English, English-Gaelic. Stornoway: Acair.
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This map shows the etymological links in a geographic context.