《北史·列传·卷七十一》
周武帝作《象经》，命王褒为之作注。王褒注引证详备广博，很受武帝的赞赏。
武帝作《象经》，令褒注之，引据该洽，甚见称赏。
Emperor Wu of the Zhou Dynasty wrote the "Elephant Sutra" and ordered Wang Bao to annotate it. Wang Bao's annotations were detailed and extensive, and he was greatly appreciated by Emperor Wu.