《资治通鉴·唐纪·唐纪六》
李道玄多次跟随秦王李世民征伐，死时才十九岁，李世民深为痛惜，对人说道： 道玄常跟随我征伐，见我深入敌阵，心中羡慕想要模仿，才会这样。 
道玄数从秦王世民征伐，死时年十九，世民深惜之，谓人曰： 道玄常从吾征伐，见吾深入贼陈，心慕效之，以至于此。 
Li Daoxuan repeatedly followed the Prince of Qin Li Shimin on military expeditions. He was only nineteen years old when he died. Li Shimin was deeply saddened and said to others, "Daoxuan always followed me on military expeditions. When he saw me charge into the enemy ranks, he was envious and wanted to imitate me. That's why he did that." 