《旧唐书·列传·卷六十五》
贾明观，是万年县的捕贼小官，侍奉刘希暹，依仗鱼朝恩的权势，恣意凶残，毒于豺狼。
贾明观者，本万年县捕贼小胥，事刘希暹，恃鱼朝恩之势，恣行凶忍，毒甚豺虺。
Jia Mingguan was a minor official in charge of capturing bandits in Wanyuan, serving under Liu Xixi and taking advantage of Yu Chaoen's power, he was unscrupulously savage and vicious than a wolf.