《资治通鉴·齐纪·齐纪七》
北魏江阳王元继上书孝文帝说： 高车人冥顽不化，逃避差役，反叛远遁，但是如果把他们全部追究杀戮，恐怕要引起大的扰乱。
魏江阳王继上言： 高车顽昧，避役遁逃，若悉追戮，恐遂扰乱。
Yuan Ji, the King of Jiangyang of Northern Wei, submitted a memorial to Emperor Xiaowen, saying: The Gaoche people are stubbornly ignorant, evading their corvee duties and rebelling with distant escapes; however, if we pursue and kill all of them, I’m afraid it will cause great chaos.