《明史·列传·卷四十八》
不久因宣府、大同军务长期废弛，魏源请召回巡抚佥都御史卢春，而推荐兵部侍郎于谦为镇守参赞。
寻以宣、大军务久弛，请召还巡抚佥都御史卢睿，而荐兵部侍郎于谦为镇守参赞。
Not long after, because of the long-term abandonment of Xuanfu and Datong military affairs, Wei Yuan asked to recall the patrolled Inspection Censor-in-chief Lu Chun, while recommending Ministry of War Assistant Minister Yu Qian to be the garrison defense assistant.