《资治通鉴·后梁纪·后梁纪三》
李严是幽州人，广泛阅读书籍传记，晋王李存勖让他教授自己的儿子李继岌，李严坚决推辞。
严，幽州人也，涉猎书传，晋王使传其子继岌，严固辞。
Li Yan is a native of You Prefecture who has read many books and biographies. The Prince of Jin, Li Cunxu, wants him to teach his son Li Jiji, but Li Yan firmly declines.