《新唐书·列传·卷二十九》
晋王李治立为皇太子，又任命于志宁为太子左庶子，升任侍中，授予光禄大夫，提高封号为燕国公，主持编撰本朝历史。
晋王为皇太子，复拜左庶子，迁侍中，加光禄大夫，进封燕国公，监脩国史。
Li Zhi, the Prince of Jin, was established as crown prince and Yu Zhining was again appointed as Zuo Shuozi (assistant junior tutor) of the Crown Prince, promoted to be Shizhong (Palace Attendant), granted the rank of Guanglu Daifu (Grand Master of the Palace Banquet), and elevated to the title of Duke of Yan, in charge of compiling the history of this dynasty.