There are lots of books that you can read about chocolate! Here is a list of a few.
1.Mary Marony and the Chocolate Surprise by Suzy Kline.
2.Curious George goes to a Chocolate Factory by Margret and H.A. Rey.
3.Charlie and the Chocolate Factory by Roald Dahl
4.Charlie and the Great Glass Elevator by Roald Dahl
5.Chocolate Fever by Robert Kimmel Smith
These are just a few but you can check these and many more out at your local library. You can also look at books that actually teach you about chocolate! Books like that can be found at book stores or even cooking supply stores! Some of these books are great, like Charlie and the Chocolate Factory, which is read all around the world by many people and you can read all about it on another page.