《北史·列传·卷八》
皇帝亲征凉州时，让穆寿辅佐景穆帝，总管机要大事，内外都听命于他。
舆驾征凉州，命寿辅景穆，总录机要，内外听焉。
When the emperor led the expedition to Liangzhou, he asked Mu Shou to assist Emperor Jing Mu and take charge of important affairs. Both inside and outside listened to his orders.