↑ Anthony, David W. (2007). The Horse, the Wheel, and Language: How Bronze Age Riders from the Eurasian Steppes Shaped the Modern World. Princeton, NJ: Nhà in Đại học Princeton. ISBN9780691058870.
↑ Benecke, Norbert; Von den Dreisch Angela (2003). “Horse exploitation in the Kazakh steppes during the Eneolithic and Bronze Age”. Trong Levine Marsha; Renfrew Colin; Boyle Katie. Prehistoric Steppe Adaptation and the Horse. Cambridge: McDonald Institute. tr. 69–82. ISBN1902937090. Chú thích sử dụng tham số |coauthors= bị phản đối (trợ giúp)
↑ Needham, Joseph (1986). Science and Civilization in China; Quyển 4, Physics and Physical Technology, Phần 2, Mechanical Engineering. Đài Bắc: Caves Books.
↑ Clutton-Brock, Juliet (1992). Horse Power: A History of the Horse and the Donkey in Human Societies. Cambridge, MA: Nhà in Đại học Harvard. tr. 138. ISBN067440646X.
