《旧唐书·列传·卷十五》
太宗回想起开创帝业的艰难，功臣们所做的贡献，又写了《威凤赋》赠送给长孙无忌。
太宗追思王业艰难，佐命之力，又作《威凤赋》以赐无忌。
Taizong recalled the arduity of establishing the empire and the contributions made by his heroes, and so he wrote the “Poem of the Mighty Ancestral Phoenix” and presented it to Changsun Wuji.