1. The origins of horseback riding;Anthony;Antiquity,1991
2. Bit wear, horseback riding, and the Botai site in Kazakstan;Anthony;J. Arch. Sci.,1998
3. Bibikova , V.I. 1967 A study of the earliest domestic horses of Eastern Europe reprinted in Dereivka, a settlement and cemetery of Copper Age horse keepers on the Middle Dnieper D.Y. Telegin 135 62
4. Bibikova , V.I. 1969 On the History of Horse Domestication in South-East Europe reprinted in Dereivka, a Settlement and Cemetery of Copper Age horse keepers on the Middle Dnieper D.Y. Telegin 163 82