《资治通鉴·晋纪·晋纪十》
赵固随梁伏疵向西边进发，王桑却又带领所属军队向东奔赴青州，赵固就派兵追击，在曲梁杀了王桑。王桑的部将张凤带领残余部众投归刘演。
固随疵而西，桑引其众东奔青州，固遣兵追杀之于曲梁，桑将张凤帅其馀众归演。
Zhao Gu followed Liang Fuci westward, but Wang Sang led his troops eastward to Qingzhou, so Zhao Gu sent troops to pursue him and killed Wang Sang in Quliang. Wang Sang's general Zhang Feng led the remaining troops to Liu Yan.