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Jeremy Tredinnick. Pre-history: Human migrations and the the stone age // See: Tredinnick J. An illustrated History of Kazakhstan: Asia’s Heartland in Context. Published by Odyssey Books & Maps. 2014. P. 20
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History of Civilizations of Central Asia.Volume II: The Development of Sedentary and Nomadic Civilizations: 700 B.C. to A.D. 250 / Edited by Janos Harmatta, B. J. Puri, and G. F. Etemadi Paris: UNESCO Publishing, 1999. P.23.
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Tong-Yabghu-Kagan // See: http://www.statemaster.com/encyclopedia
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Tong-Yabghu-Khagan see; http://www.statemaster.com/encyclopedia/Tong-Yabghu-Khagan
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Battle of Talas in 751. See online encyclopedia Statemaster.com URL: http://www.statemaster.com/encyclopedia/Battle-of-Talas
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Agajanov S. G. The States of the Oghuz, the Kimek and the Kipchak. P.74-77. URL: http://ru.unesco.org/silkroad/sites/silkroad/files/knowledge-bank-article/vol_IVa%20silk%20road_the%20states%20of%20the%20oghuz,%20the%20kimek%20and%20the%20kipchak.pdf. Avaiable 20 June. 2016.
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Ancient Turkish Religious Beliefs (Pre-Islam). Posted: 17-Jun-2005. URL: http://www.allempires.com/forum/forum_posts.asp?TID=4017