Xin Tangshuvol. 217a "回紇，其先匈奴也，俗多乘高輪車，元魏時亦號高車部，或曰敕勒，訛為鐵勒。" tr: "Uyghurs, their predecessors were the Xiongnu. Because, customarily, they ride high-wheeled carts. In Yuan Wei time, they were also called Gaoju (i.e. High-Cart) tribe. Or called Chile, or mistakenly as Tiele."
WeishuVol 103 Gaoju "高車，蓋古赤狄之餘種也，[...] 諸夏以為高車丁零。" tr. "Gaoju, probably the remnant stock of the ancient Red Di. [...] The various Xia (i.e. Chinese) considered them Gaoju Dingling (i.e. Dingling with High Cart)"
