What's a good Thai cookbook?

Over the last few years I spent a lot of time in Thailand, almost a year cumulatively. Now that I’m back in the States, I want to find a good Thai cookbook so I can make the dishes I liked in Thailand. Unfortunately, I found in the States most recipes for Thai cuisine has been Americanized, meaning its much to sweet and lacks some of the key Thai ingredients. Does anyone know of authentic Thai cookbooks?