《明史·列传·卷六十六》
工部侍郎杜谦等前往调查，按实事情况公平地对待，返京向朝廷奏报换置将帅是同阮勤说的情况相符，没有侵吞建边墙的费用。
工部侍郎杜谦等往勘，平情按之。还奏易置将帅如勤等言，所费无私。
The Minister of Public Works, Du Qian, and others went to investigate, and explained the situation fairly, and reported to the court when they returned to Beijing that the exchange of generals was consistent with what Ruan Qin  had said, and that he had not embezzled expenses for building the border wall.