《宋书·志·卷二十九》
元嘉：二十五年七月壬辰门，嘉禾生长于北海，青、冀二州刺史杜坦献上朝廷。
元嘉二十五年七月壬辰，嘉禾生北海，青、冀二州刺史杜坦以献。
Year of Yuanjia: July on the day of renchen in the twenty-fifth year, jiahe appeared in Beihai, and Dutan, the governor of Qing and Ji states, offered it to the imperial court.