《资治通鉴·唐纪·唐纪四十六》
张用诚被李怀光所引诱，暗中与李怀光互通阴谋，德宗听说很是担心。
用诚为怀光所诱，阴与之通谋，上闻而患之。
Zhang Yongcheng was seduced by Li Huaiguang and secretly conspired with Li Huaiguang against the emperor. When Emperor Dezong heard this, he was very worried.