《明史·志·卷五十六》
近来御史刘良卿也纳粮换茶一百万斤，后来只换正式额数八十万斤，合并赋税茶、私茶总计仅九十余万。
近者御史刘良卿亦开百万，后止开正额八十万斤，并课茶、私茶通计仅九十馀万。
Recently, Censor Liu Liangqing also exchanged 1 million catties of grain for tea, but later only exchanged 800,000 catties on the official quotas, combining the official quotas of tea and privately traded tea to a total of just over 900,000.