《金史·列传·卷四十三》
显宗当皇太子时，挑选东宫的属官，张浩向他推荐杨伯雄，于是在服满后被起用任少詹事。杨伯雄哥哥的儿子蟠担任左赞善，他们进谏时言听计从，当时的舆论都以此为荣。
显宗为皇太子，迁东宫官属，张浩荐伯雄，起复少詹事，兄子蟠为左赞善，言听谏从，时论荣之。
When Xianzong was the Crown Prince, he selected officials for the east palace. Zhang Hao recommended Yang to him. So Yang was appointed as Shaozhan after the mourning period. Yang's younger brother's son Pan was appointed as Zuozanshan. When they admonished, the emperor often listened to them. At that time, this was considered a great honor.