《旧唐书·本纪·卷六》
秋七月，突厥骨笃禄、元珍入侵朔州，命令左威卫大将军程务挺率兵抵御他们。
秋七月，突厥骨咄禄、元珍寇朔州，命左威卫大将军程务挺拒之。
In the seventh month of autumn, Easton's Gulu and Yuanzhen invaded Shuozhou, and he ordered Cheng Wuting, the general of the Left Weiwei, to lead troops to resist them.