《资治通鉴·汉纪·汉纪二十九》
其中钱币六种，金币一种，银币二种，龟币四种，贝币五种崐，布币十种。总计，货币共有五类、六种名称，二十八个等级。
钱货六品，金货一品，银货二品，龟货四品，贝货五品，布货十品，凡宝货五物、六名、二十八品。
Among the six currencies, gold was one type, silver two types, turtle four types, cowry five types and cloth ten types. In total, there were five categories, six names and twenty-eight values of currencies.