《资治通鉴·唐纪·唐纪二十九》
自从王孝杰收复龟兹、疏勒、于阗、焉耆四镇后，朝廷又在龟兹设置安西都护府，派遣三万军队驻守这个地区，老百姓深受远戍安西的兵、徭役之苦。在历任安西都护中，只有田杨名、郭元振、张嵩和杜暹都有一些好的政绩，因而被人们所称颂。
自王孝杰克复四镇，复于龟兹置安西都护府，以唐兵三万戍之，百姓苦其役；为都护者，惟田扬名、郭元振、张嵩及暹皆有善政，为人所称。
Since Wang Xiaojie recovered the four towns of Guizi, Shule, Yutian, and Yanqi, the court set up the Anxi Protectorate in Guizi and sent 30,000 troops to guard the area. The people suffered deeply from the soldiers and corvee in the west of Anxi. Among the former Anxi defenders, only Tian Yangming, Guo Yuanzhen, Zhang Song, and Du Xian had some good political achievements, and therefore were praised by the people.