《旧唐书·列传·卷一百二十二》
宣宗大中初年，牛僧孺逝世，追赠他太子太师衔，谥号文贞。
大中初卒，赠太子太师，谥曰文贞。
Niu Sengru died in the early years of the Da Zhong reign of Emperor Xuanzong. He was posthumously awarded the title Grand Tutor of the Crown Prince and given the posthumous appellation of Wen Zhen.