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.
Hrach K. Martirosyan. Etymological Dictionary of the Armenian Inherited Lexicon. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Orel, Vladimir E. (1998). Albanian etymological dictionary. Leiden: Brill
DEX online (2004-2015). Dicționare ale limbii române. https://dexonline.ro/
Robert Farren, PIE culture words collection, 2017
CG103, CG139, CG147, CG149, CG151, CG153
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This map shows the etymological links in a geographic context.