《汉书·传·傅常郑甘陈段传》
匡衡、石显认为 郅支本来是丧失国家逃亡在外，衹在无人的地方盗用名号，并非是真的单于。 
匡衡、石显以为 郅支本亡逃失国，窃号绝域，非真单于 。
Kuang Heng and Shi Xian thought that Zhizhi had lost his country and was escaping. Using his title only in uninhabited areas, he was not really a Shanyu.