《新唐书·本纪·卷七·德宗 顺宗 宪》
德宗，名适，是代宗的长子。母亲是睿真皇太后沈氏。当初，沈氏在开元末年被选入代宗宫中。
德宗神武圣文皇帝讳适，代宗长子也。母曰睿真皇太后沈氏。初，沈氏以开元末选入代宗宫。
De-Zong, by the name of Shi, was Dai-Zong's eldest son. His mother was Rui-Zhen Empress Dowager Shen. In the late years of Kai-Yuan, Shen was selected to enter the palace of Dai-Zong.