《明史·志·卷四十四》
皇太子的册宝。册符用黄金，为二片，它的形制以及匣子的装饰与皇后的册符相同。
皇太子册宝：册用金，二片，其制及盝箧之饰与皇后册同。
Seal of the Crown Prince. The seal used gold and was made in two halves. Its shape and the decoration of its case were the same as those of the seal of the empress.