Bennett, Deb (1998). Conquerors: The Roots of New World Horsemanship (First ed.). Solvang, CA: Amigo Publications, Inc. pp. 6–8. ISBN0-9658533-0-6. OCLC39709067. OL711950M.
Anthony, David W. (2007). The Horse, the Wheel, and Language: How Bronze-Age Riders from the Eurasian Steppes Shaped the Modern World. Princeton, NJ: Princeton University Press. pp. 196–197, 202. ISBN978-0-691-05887-0. OL11182657M.
Bennett, Deb (1998). Conquerors: The Roots of New World Horsemanship (First ed.). Solvang, CA: Amigo Publications, Inc. pp. 6–8. ISBN0-9658533-0-6. OCLC39709067. OL711950M.