《资治通鉴·汉纪·汉纪二十二》
杜钦向大将军王凤献策说： 蛮夷王侯轻视汉使，不惧怕朝廷的权威，我担心参议这个问题的人胆小怯懦，仍然坚持和解之策。
杜钦说大将军王凤曰： 蛮夷王侯轻易汉使，不惮国威，恐议者选耎，复守和解；太守察动静有变，乃以闻。
Du Qin offered a plan to General Wang Feng, saying: The barbarian kings and marquises look down on the Han envoys and do not fear the authority of the court. I am afraid that those who deliberate on this issue may be cowardly and timid, and will still insist on a policy of appeasement.