author., Anthony, David. The Horse, the Wheel, and Language. OCLC1102387902.
J., Harrison, Richard. The transformation of Europe in the third millennium BC: the example of "Le Petit-Chasseur I + II" (Sion, Valais, Switzerland), გვ. 196. OCLC718304072.
P., Mallory, J. (2003). In search of the Indo-Europeans : language, archaeology, and myth. Thames and Hudson, გვ. 213. ISBN0-500-27616-1. OCLC886668216.