《史记·十二本纪·孝武本纪》
后来，天子的宫苑中养有白鹿，有人说以其皮制作皮币，可以引发祥瑞感应，就又铸造白金币。
其后，天子苑有白鹿，以其皮为币，以发瑞应，造白金焉。
Later, there were white deer in the Son of Heaven's palace garden. Some people said that using its leather to make fur coins could trigger auspicious induction, so they cast white gold coins.