《魏书·列传·卷九》
世宗再就这事询问高肇，高肇以魏偃、祖珍为证人，世宗就相信了造件事。
世宗更以问肇，肇以魏偃、祖珍为证，世宗乃信之。
Emperor Shizong asked Gao Zhao about this matter again, and Gao Zhao used Wei Yan and Zu Zhen as witnesses, so Emperor Shizong believed in this fabricated matter.