《资治通鉴·晋纪·晋纪二十八》
贺氏当晚让刘显喝酒，等他喝醉以后，让拓跋暗中与旧臣长孙犍、元他、罗结轻装骑马逃走。
贺氏夜饮显酒，令醉，使珪阴与旧臣长孙犍、元他、罗结轻骑亡去。
He Shi let Liu Xian drink that night. After he got drunk, he let Tuoba secretly escape on horseback with his old ministers Changsun Jian, Yuan Ta, and Luo Jie.