《周书·本纪·卷五》
五月己丑曰，武帝制定的《象经》完成，招集百官宣讲讨论。
五月己丑，帝制象经成，集百僚讲说。
On the jichou day in the fifth month, Emperor Wu’s finalized version of the Treatise on Images was completed, and he summoned all officials to expound on and discuss it.