《北史·列传·卷六十九》
孙惠蔚进入东观以后，看到典籍不全备，阅读旧的典籍，原先没有确定目录，新的旧的杂揉在一起，首尾不全，有的典籍埋积几十帙，没有的成年不加撰刻。
惠蔚既入东观，见典籍未周。及阅旧典，先无定目，新故杂糅，首尾不全，有者累袠数十，无者旷年不写。
After Sun Huinü entered the Dongguan, he saw that the classics and statutes were incomplete. He read the old classics and statutes and found that the texts were not catalogued properly. The new and old texts were mixed together, incomplete at the beginning and the end, and some classics and statutes had been buried for decades. There were years in which they were not carved and added.