《资治通鉴·陈纪·陈纪九》
当初，北周、北齐官府所铸造的钱币先后共有四种，加上民间私自铸造的钱币，名称和品种很多，轻重也不一样。
初，周、齐所铸钱凡四等，及民间私钱，名品甚众，轻重不等。
At the beginning, there were four types of coins cast by the government of Northern Zhou and Northern Qi. In addition to the coins privately cast by the people, there were many names and varieties, and the weights were different.