《明史·志·卷五十四》
正统初年，愈事夏时创制施行于江西，其它省仿效施行，徭役因此稍稍平衡。
正统初，佥事夏时创行於江西，他省仿行之，役以稍平。
During the early years of the Zhengtong reign, Yu Shi founded an institution based on the Xia system, implemented it in Jiangxi Province, and other provinces followed suit, which resulted in slightly balanced corvée labour.