《后汉书·列传·邓张徐张胡列传》
十六年，徐防拜为司徒，延平元年，升为太尉，与太傅张禹参录尚书事，数次得过赏赐，甚见优宠。
十六年，拜为司徒。延平元年，迁太尉，与太傅张禹参录尚书事，数受赏赐，甚见优宠。
In the 16th year, Xu Fang was appointed as Minister of the Bureau of Personnel; in the 1st year of the Yanping era, he was promoted to Grand Tutor; and with Imperial Tutor Zhang Yu, he was responsible for reviewing files of the Imperial Secretariat; he was awarded with prizes several times and was greatly favored by the emperor.