《资治通鉴·宋纪·宋纪十六》
当初，褚渊任卫将军，因母亲去世而离职，朝廷一再征召他，他都拒绝。
初，褚渊为卫将军，遭母忧去职，朝廷敦迫，不起。
At the beginning, Chu Yuan was the General of the Guard, but he left office because his mother passed away. The court repeatedly summoned him, but he refused.