《资治通鉴·唐纪·唐纪八十》
李克用的使者自京师回到晋阳，讲述崔胤专横霸道的情形，李克用说： 崔胤身为人臣，在外倚靠强贼的势力，在内胁迫自己的君主，既主持朝政，又掌握兵权。
李克用使者还晋阳，言崔胤之横，克用曰： 胤为人臣，外倚贼势，内胁其君，既执朝政，又握兵权。
Li Keyong's envoy returned to Jinyang from the capital, recounting Cui Yin's overbearing and domineering behavior. Li Keyong said: Cui Yin, as a minister, relied on the power of a strong thief outside, and coerced his sovereign inside, both presiding over state affairs, and holding military power.