Mierse, William E. (1 December 2022). Artifacts from the Ancient Silk Road. ABC-CLIO. p. 126. ISBN978-1-4408-5829-1. "In the upper scene, long-haired Turkic servants attend an individual seated inside the yurt proper, and in the lower scene, hunters are seen riding down game. The setting must be the Kazakh steppes over which the Turks had taken control from the Hepthalites."
KALAFAT, Yaşar. "Türkatalars and Their Comparative Folk Beliefs"(PDF). Avrasya Etüdler: 171. [The study presented by Bilge Kağan Selçuk, who participated in the aforementioned symposium with a linguistic research on the Özgön Turks in Kyrgyzstan, had caught our attention. The Turkic-Ancestors in question who include the Özgön people are predominantly settled in the Fergana Valley, and identify themselves as descendants of the Göktürks have come to be referred to by the honorary designation Turkic-Ancestors]
"Karluk Yabghu State (756-940)"Qazaqstan Tarihy. quote: "In 840, in the Central Asian steppes an important event occurred. The Yenisei Kyrgyz invasion destroyed the Uighur Khaganate, forcing the Uighurs to flee to Turfan oasis and to Gansu [original article mistakenly has Guangzhou]. The Karluk Djabgu and the ruler of Isfijab, Bilge Kul Qadeer-Khan, took advantage of the situation and proclaimed himself as a sovereign ruler and assumed a new title of Khagan."
