《资治通鉴·齐纪·齐纪六》
元澄把穆泰等人的罪行一项项地列出，上表奏告孝文帝，孝文帝阅后非常高兴，召集公卿大夫们到一起，把元澄的上表出示给他们看，并且说道： 任城王可以说是社稷功臣啊！
澄具状表闻，帝喜，召公卿，以表示之曰： 任城可谓社稷臣也。
Yuan Cheng listed each of Mu Tai's crimes item by item and submitted a memorial to Emperor Xiaowen, who was very pleased after reading it. He summoned the Dukes and Ministers together, showed them Yuan Cheng's memorial, and then said: The Prince of Rencheng can be called a meritorious official of the state!