Some Gluten Free Cookbooks that I have found helpful

Eating Gluten Free by Shreve Stockton
The Gluten-Free Kitchen by Roben Ryberg
Gluten-Free by Michael Cox
Gluten-Free Cooking by Anne Sheasby
Going against the Grain: Wheat Free Cookery by Phyllis L. Potts
Gluten Free food for Kids by Sheri L. Sanderson
Gluten-Free Baking by Rebecca Reilly

and several books by the master of Gluten Free Cooking: Bette Hagman
The Gluten-free Gourmet Cooks Comfort Foods
More from the Gluten-Free Gourmet
The Gluten-free Gourmet Bakes Bread
The Gluten-free Gourmet Cooks Fast and Healthy

I have a lot of cookbooks. It's amazing how many of these books you can find in the "Diet Cookbook" section of your local bookstore. However, you can order a lot of these books through your local library and try them out before buying them at your bookstore or online.