《资治通鉴·隋纪·隋纪四》
杨谅看到发来的玺书与原约不能验证，就知道出了事，他盘问屈突通，屈突通闪烁其词而不回答，于是，屈突通被打发回长安，杨谅起兵造反。
及发书无验，谅知有变。诘通，通占对不屈，乃遣归长安。谅遂发兵反。
Yang Liang saw the edict he received could not be verified with the original agreement and knew that something was wrong. He interrogated Qu Tutong, who was evasive and refused to answer. Consequently, Qu Tutong was sent back to Chang'an and Yang Liang raised troops in rebellion.