《宋书·志·卷二十九》
元嘉二十年七月，堑球人刘原秀又获得白乌献给朝廷。
元嘉二十年七月，彭城刘原秀又获白乌以献。
In the seventh month of the 20th year of the Yuanjia period, Liu Yuanxiu, a native of Qiedui, received a white bird and presented it to the court.