《新唐书·列传·卷十四》
别部同罗、仆骨、回纥、薛延陀之徒，全都自立君长，谋图反攻，众叛于下，这是第二条可攻之处。
别部同罗、仆骨、回纥、延陀之属，皆自立君长，图为反噬，此众叛于下，可取二也。
Other tribes such as Tongluo, Pugubone, Huihe, and Xue Yantu all established their own leaders and planned to counterattack, and the people were in a state of rebellion, which was the second place to attack.