《北史·列传·卷八十四》
文成帝时定阳侯曹安上表说拾寅现在的城堡白兰，有许多金银、牛马，如攻打它们，可以有很大的收获。
文成时，定阳侯曹安表拾寅今保白兰，多有金银、牛马，若击之，可以大获。
During Emperor Wencheng's reign, Marquis Cao An of Dingyang reported that Shuyin's current stronghold, Bailan, had abundant gold, silver, cattle, and horses. If they were attacked, great gains could be made.