Adams, Douglas Q. (2013). Etymological Dictionary of Tocharian B. Revised and Greatly Enlarged. Amsterdam - Atlanta: Rodopi.
Pinault, Georges (1998). Terminologie de petit bétail en Tokharien. Studia Etymologica Cracovensia 2: 175-218.
Robert Farren, PIE culture words collection, 2017
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This map shows the etymological links in a geographic context.