《资治通鉴·宋纪·宋纪一》
北魏刁雍前往邺城晋见北魏国主拓跋嗣，拓跋嗣说： 叔孙建等进入青州地区，老百姓纷纷躲藏，而城又久攻不下。
刁雍见魏主于鄴，魏主曰： 叔孙建等入青州，民皆藏避，攻城不下。
Northern Wei general Diao Yong went to Ye City to meet with Northern Wei emperor Tuoba Si, who said: Shusun Jian and others entered the Qingzhou area, and the common people hid one after another, and the city could not be captured after a long siege.