《宋史·列传·卷三十一》
等到请和，宋真宗选守卫边境各州的官员，亲笔录用给宰相看，任命杨延昭为保州知州兼缘边都巡检使。
及请和，真宗选边州守臣，御笔录以示宰相，命延昭知保州兼缘边都巡检使。
When they applied for peace, Song Zhenzong picked the officials who guarded the border areas, made a copy of the personal writing to the prime minister and appointed Yang Yanchao as the magistrate of Baizhou and concurrently served as the general inspector of the border.