《资治通鉴·唐纪·唐纪七十五》
李茂贞献上杨复恭以前给杨守亮的信，信上陈诉他退职的情由说： 唐朝的江山本是隋朝的旧业，大侄你只管积存粮食训练士兵，不要向朝廷进贡。
李茂贞献复恭遗守亮书，诉致仕之由云： 承天门乃隋家旧业，大侄但积粟训兵，勿贡献。
Li Maozhen presented a letter that Yang Fugong had previously given to Yang Shouliang. It explained the reasons for his resignation, saying: “The Tang Dynasty is built on the remains of the Sui Dynasty. Nephew, just store up food and train your troops. Don’t pay tribute to the court.”