《资治通鉴·隋纪·隋纪六》
当时盗贼到处蜂起：齐郡人王薄、孟让，北海人郭方预，清河人张金称，平原人郝孝德，河间人格谦，勃海人孙宣雅分别聚众攻城抢劫，他们多的达十余万人，少的有几万人。崤山以东的地方深受其害。
时所在盗起，齐郡王薄、孟让、北海郭方预、清河张金称、平原郝孝德、河间格谦、勃海孙宣雅，各聚众攻剽，多者十馀万，少者数万人，山东苦之。
At that time, bandits sprang up everywhere. Wang Bo and Meng Rang from Qijun, Guo Fangyu from Beihai, Zhang Jincheng from Qinghe, Hao Xiaode from Pingyuan, Ge Qian from Hejian, and Sun Xuanya from Bohai each gathered followers to attack cities and rob people. The largest bands had over 100,000 followers, and the smallest had tens of thousands. The areas east of Mount Xiaoshan suffered greatly.