《魏书·列传·卷八十八》
乙力支说他们勿吉国早先打败高句丽国的十个部落，又秘密地同百济国谋划，打算从水路合力攻取高句丽，特地派遣乙力支奉使大魏国，向朝廷请示这样做是否妥当。
自云其国先破高句丽十落，密其百济谋从水道并力取高句丽，遣乙力支奉使大国，请其可否。
Yilizhi said that his Wuji had previously defeated ten tribes of Goguryeo, and that he had secretly plotted with Baekje to jointly attack Goguryeo by water routes. He specially dispatched Yilizhi to the Northern Wei court to petition for instructions on whether to take action.