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.
Orel, Vladimir E. (1998). Albanian etymological dictionary. Leiden: Brill
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.