《金史·列传·卷二十七》
梁肃下文书给肇州、北京、广宁盐场，允许人民用米换盐，军队人民都得利。
移牒肇州、北京、广宁盐场，许民以米易盐，兵民皆得其利。
Liang Su sent out a document to the salt fields in Zhaozhou, Beijing, and Guǎngníng, allowing people to trade rice for salt, so that both the army and the people benefited.