《资治通鉴·汉纪·汉纪十七》
元康三年戊午，公元前年春季，三月，汉宣帝下诏封原昌邑王刘贺为海昏侯。
中宗孝宣皇帝上之下元康三年春，三月，诏封故昌邑王贺为海昏侯。
In the spring of the third year of Yuankang, that is, in the spring of the third year of Yuankang, in March, Emperor Xuan of the Han Dynasty issued an edict to appoint Liu He, the former king of Changyi, as the Marquis of Haihun.