《资治通鉴·唐纪·唐纪十八》
乙亥，唐朝派遣右卫将军李知十等屯兵泾、庆二州以防备突厥。
春，正月，突厥寇原、庆等州。乙亥，遣右卫将军李知十等将兵屯泾、庆二州以备突厥。
Yi Hai, the Tang Dynasty sent the Right Guard General Li Zhi and Shi to station troops in Jing and Qing states to guard against the Turks.