《资治通鉴·宋纪·宋纪二》
辛酉，北魏国主拓跋焘从统万出发，向东回国。拓跋焘任命常山王拓跋素为征南大将军、假节，命他与执金吾桓贷、莫云留下镇守统万。
辛酉，魏主自统万东还，以常山王素为征南大将军、假节，与执金吾桓贷、莫云留镇统万。
Xin You, King of Northern Wei, Tuoba Tao, left Tongwan and headed east to return to the country. Tuoba Tao appointed Changshan King Tuoba Su as the Grand Marshal for the Conquest of the South and the fake guard, and ordered him to remain in Tongwan to defend with Zhijingu Huan Dai and Moyun.