《北齐书·列传·卷四十五》
崔季舒等人想劝谏皇上，不要到晋阳去，颜之推急忙返回家中，所以没有联合署名。
崔季舒等将谏也，之推取急还宅，故不联署。
Cui Jishu and others wanted to advise the emperor not to go to Jinyang, Yan Zhitui quickly returned home, so he did not sign jointly.