《后汉书·列传·杨震列传》
父亲杨宝，学《欧阳尚书》，哀帝、平帝时，不问世事，隐居教学。
父宝，习《欧阳尚书》。哀、平之世，隐居教授。
His father Yang Bao studied "Ouyang Shangshu". During the reign of Emperor Ai and Emperor Ping, he retreated from worldly affairs and taught in seclusion.