《新唐书·列传·卷一百一十三》
李承嗣说： 您如果能派兵悄悄杀奔清口，打败那里的敌军，葛从周不打就会败逃。 
李承嗣曰： 公能潜师趋清口，破其众，则从周不击而溃。 
Li Chengsi said: If you can send troops to quietly rush to Qingkou and defeat the enemy there, Ge CongZhou will flee without even fighting.