《新唐书·列传·卷一百四十四》
守王圭善于指挥战役，可突于害怕了，表面请降，而实际上渐往西北去倚靠突厥。
守珪既善将，可突于恐，阳请臣而稍趋西北倚突厥。
Shou Wanggui was good at commanding campaigns, making Kutulu fearful. Kutulu offered fake surrender and actually moved northwest to rely on the Turks.