《资治通鉴·后晋纪·后晋纪四》
到这时，三司使董遇想要增加超额的税赋，又难于突然改变以前的法度，便加重向盐商征税，经过这里的每斤收七钱，留在这里售卖的每斤收十钱。
至是，三司使董遇欲增求羡利，而难于骤变前法，乃重征盐商，过者七钱，留卖者十钱。
At that time, the Sansi Envoy Dong Yu wanted to increase the excessive taxes, but it was difficult to suddenly change the previous laws, so he increased the tax on salt merchants, collecting seven coins per jin for those who passed through the area, and ten coins per jin for those who sold there.