《旧唐书·本纪·卷十五》
六月初七，任命金紫光禄大夫、暂署司徒、同平章事、崇文馆大学士、太清宫使、上柱国、岐国公杜佑为光禄大夫、署理太保，离任退休，应在每月朔日和望日上朝觐见皇上，这是杜佑多次恳请退休的缘故。
癸巳，以金紫光录大夫、守司徒、同平章事、崇文馆大学士，太清宫使、上柱国、岐国公杜佑为光禄大夫，守太保致仕，宜朝朔望，佑累表恳请故也。
On the seventh day of the sixth lunar month, Jinziguanglu大夫, acting Situ, Tongpingzhangshi, Chongwen Museum University Scholar, Taiqing Palace Envoy, Shangzhu Kingdom, and Qi Guogong Du You were appointed as Guanglu大夫, acting Taibao, and retired from office. He should go to court to meet the emperor on the first and fifteenth days of each month. This was because Du You had repeatedly asked to retire.