《资治通鉴·唐纪·唐纪三十四》
这时河西司马裴冕入朝为御史中丞，路过平凉见到太子，也奉劝太子去朔方，太子同意。
会河西司马裴冕入为御史中丞，至平凉见太子，亦劝太子之朔方，太子从之。
At that time, Pei Mian of Hexi Sima entered the court to become the Censor-in-Chief. He passed Pingliang and met the Crown Prince. He also advised the Crown Prince to go to Shuofang. The Crown Prince agreed.