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.
Michiel de Vaan. Etymological Dictionary of Latin and the other Italic Languages. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Trésors de la langue francaise informatisées. Centre national de ressources techniques et lexiques. http://www.cnrtl.fr/definition/
DEX online (2004-2015). Dicționare ale limbii române. https://dexonline.ro/
Robert Farren, PIE culture words collection, 2017
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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.