《后汉书·列传·南匈奴列传》
陈龟认为单于未能管好部下，就逼迫单于，单于和弟弟左贤王都自杀了。
龟以单于不能制下，逼迫之，单于及其弟左贤王皆自杀。
Chen gui believed that Shan Yu had failed to manage his men, so he coerced Shan Yu, and both Shan Yu and his younger brother Zuo Xian Wang committed suicide.