《资治通鉴·唐纪·唐纪五十四》
田季安得到快马传递的报告，事先已经知道了朝廷的任命，便派人告诉承宗说： 薛昌朝暗中与朝廷交往，所以他才得到节度使的职位。 
田季安得飞报，先知之，使谓承宗曰： 昌朝阴与朝廷通，故受节钺。 
Tian Ji’an already knew about the appointment of the imperial court from the report delivered by a fast horse. He sent someone to tell Chengzong, “Xue Changzhao secretly communicated with the imperial court, which is why he was given the position of governor.”