《汉书·传·酷吏传》
神爵年间，西羌反叛，强弩将军许延寿邀请严延年做长史，从军出征并打败了西羌。回朝后，他被任命为涿郡太守。
神爵中，西羌反，强弩将军许延寿请延年为长史，从军败西羌，还为涿郡太守。
During the Shenjue period, the West Qiang rebelled. General Xu Yanshou invited Yan Yinian to be the long history, and joined the army to defeat the West Qiang. After returning to the imperial court, he was appointed as the prefect of Zhuojun.