《资治通鉴·唐纪·唐纪十四》
唐太宗贞观十九年六月，丁酉，李世攻打白岩城西南，太宗亲临城西北。
贞观十九年乙巳，公元六四五年
In June in the 19th year of Emperor Taizong of Tang's reign (貞觀), on a dingyou day, Li Shimin attacked the southwest of Baiyan City, and Emperor Taizong was in person to the northwest of the city.