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.
Hrach K. Martirosyan. Etymological Dictionary of the Armenian Inherited Lexicon. 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
AG173, AG173, EE173, EE173
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This map shows the etymological links in a geographic context.