《魏书·列传·卷六十五》
又下诏说： 秘书省是国家图籍所在的地方，掌管群籍，又加缮写，尺牍委积，已有多年。
又诏曰： 秘书图籍所在，内典□书，又加缮写，缃素委积，盖有年载。
In addition, an edict was issued: The Department of Imperial Library is where the books of the country are located, and it is responsible for managing the books and writing more. The correspondence has been piled up for many years. 