《魏书·列传·卷四十四》
酸枣令郑伯孙、鄄城令童腾、别驾贾德、治中申灵度，都为官廉洁贞正，勤恤百姓，郑羲都上表称赞推荐他们，时论也称赞他的行为。
酸枣令郑伯孙、鄄城令董腾、别驾贾德、治中申灵度，并在任廉贞，勤恤百姓，羲皆申表称荐，时论多之。
The magistrate of Suanzao Zheng Bosun, the magistrate of Juancheng Tong Teng, the deputy Jide, and the chief assistant Shen Lingdu were all honest and upright officials who diligently cared for the people. Zheng Xi highly praised and recommended them in his report, and his behavior was also praised by public opinion at the time.