《资治通鉴·唐纪·唐纪三》
隋朝义成公主派人迎接隋萧皇后和南阳公主到突厥，窦建德派遣一千多骑兵护送，又将宇文化及的首级献给义成公主。
隋义成公主遣使迎萧皇后及南阳公主，建德遣千馀骑送之，又传宇文化及首以献义成公主。
Princess Yicheng of Sui sent someone to invite Empress Xiao and the Princess of Nanyang to the Eastern Turks. Dou Jiande sent over a thousand cavalry to escort them and also presented the head of Yu Huaji to Princess Yicheng.