《资治通鉴·后唐纪·后唐纪二》
后唐帝认为契丹人的存在是个忧患，和郭崇韬谋划，因有名望的老将们差不多都不在了，李绍斌的威望平时也不高，于是就想调李嗣源去镇守真定，作为李绍斌的后援，郭崇韬深感这样做是很适宜的。
上以契丹为忧，与郭崇韬谋，以威名宿将零落殆尽，李绍斌位望素轻，欲徙李嗣源镇真定，为绍斌声援，崇韬深以为便。
Emperor Tang considered the Khitans a threat and conspired with Guo Chongtao. Since most of the elder statesmen with prestige were gone and Li Shaobin's prestige was not high enough, he wanted to transfer Li Siyuan to the garrison at Zhen Ding as Li Shaobin's backup. Guo Chongtao strongly felt that it was appropriate to do so.