《明史·列传·卷一百二十九》
员外郎顾大章说： 杜茂既然与二仆从来往奔走三千里，又是审讯拷打时致死的，终于无法知道二仆从的姓名，他无辜服罪有什么疑问？佟卜年虽然不是间谍，可终究是佟养真的族人，可把他流放三千里。 
员外郎顾大章曰： 茂既与二仆往来三千里，乃拷讯垂毙，终不知二仆姓名，其诬服何疑，卜年虽非间谍，然实佟养真族子，流三千里可也。 
Yuwai lang Gu Dazhang commented: Since Du Mao had travelled three thousand li with the two servants, and since they had died during interrogation and torture, then it is a mystery that the names of the two servants have still not been determined, can it be doubted that he was unjustly found guilty? Tong Bnian was not a spy, but he was certainly Tong Yangzhens tribesman, and so he was banished three thousand li away.