《资治通鉴·唐纪·唐纪九》
颉利败亡时，各部族首领纷纷抛弃颉利投降唐朝，惟独思摩跟随颉利，最后与颉利一同被俘。太宗嘉许他的忠诚，拜他为右武候大将军，不久又任命为北开州都督，让他统领颉利旧兵众。
颉利之亡也，诸部落酋长皆弃颉利来降，独思摩随之，竟与颉利俱擒，上嘉其忠，拜右武候大将军，寻以为北开州都督，使统颉利旧众。
When Jieli was defeated, tribal leaders abandoned Jieli and surrendered to Tang, with only Simo remaining at Jieli's side until he was apprehended beside him. Emperor Taizong, impressed by his loyalty, promoted him to General of the Right Martial Attendants, and soon after gave him title of governor of Beikaizhou to oversee the former soldiers of Jieli.