《资治通鉴·唐纪·唐纪十三》
他们中的同罗、仆骨、回纥等十多个部族，各有兵力几万人，如果他们合力攻打薛延陀，可以立即攻破取胜，之所以不敢轻举妄动，是因为畏惧是我大唐所立的可汗。
彼同罗、仆骨、回纥等十馀部，兵各数万，并力攻之，立可破灭，所以不敢发者，畏中国所立故也。
Among them, the Tongluo, Pubugu, and Uighur tribes, and more than ten other tribes, each have tens of thousands of soldiers. If they unite to attack the Xueyantuo, they can immediately defeat them and capture their lands. The reason they dare not act is because they are afraid of our Great Tang Khan. 