Allan R. Bomhard. Reconstructing Proto-Nostratic, Comparative Phonology, Morphology, and Vocabulary. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Turner, Ralph L. (1973). A comparative dictionary of the Indo-aryan languages. 2. impr. London: Oxford U.P.
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.