《资治通鉴·唐纪·唐纪五》
丁卯，李世民进入洛阳宫城，命令记室房玄龄先进入中书省和门下省，收集隋朝的地图户籍、制文诏书，但已经都被王世充销毁，没有找到什么。
丁卯，世民入宫城，命记室房玄龄先入中书、门下省收隋图籍制诏，已为世充所毁，无所获。
On Dingmao day, Li Shimin entered Luoyang Imperial Palace, and ordered Fang Xuanling to enter the Zhongshu Province first and the Menxia Province, and to collect the Sui dynasty maps, household registers, and laws and edicts, but they had already been destroyed by Wang Shichong and nothing could be found.