《魏书·列传·卷十二》
后来和崔逞给司马德宗的将领郗恢回信违背朝廷旨意，贬黜张衮为尚书令史。
后与崔逞答司马德宗将郗恢书失旨，黜衮为尚书令史。
Then He Cui replied to Xi Huai, the general of Sima Dezong, violating the court's intention, demoting Zhang Gun to the position of recorder of Shangshu order.