Adams, Douglas Q. (2013). Etymological Dictionary of Tocharian B. Revised and Greatly Enlarged. Amsterdam - Atlanta: Rodopi.
An Stòr-dàta Briathrachais Gàidhlig: http://www2.smo.uhi.ac.uk/gaidhlig/faclair/sbg/lorg.php
Michiel de Vaan. Etymological Dictionary of Latin and the other Italic Languages. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
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
Ó Dónaill, Niall & De Bhaldraithe, Tomás (red.) (1977). Foclóir Gaeilge-Béarla. Baile Átha Cliath: An Rún.
Robert Farren, PIE culture words collection, 2017
QL59, QL61, QL63
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When the etymological tree is displayed in hierarchical style, the nodes can be repositioned manually only within their level.
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This map shows the etymological links in a geographic context.