Land of Fish and Rice, Fuchsia Dunlop LINK This talks about the food from Jiangnan Region.
All Under Heaven, Carolyn Phillips LINK Beautiful book with lots of recipes from all over China. I use this one as my main guide.
If you find any Chinese-language cookbooks that seem good, HMU! I’ll be going to China in a couple days and be in Suzhou in a few weeks :D