I am a teacher of the gifted and here are a few I recommend:
1. Joyful Reading by Sally Reis
2. The Parallel Curriculum by Sandra Kaplan, and Tomlinson (
http://www.amazon.com/The-Parallel-...1360382679&sr=8-2&keywords=Sandra+Kaplan)
3. The Story of Philosophy from Bryan Magee (just as a good resource for teachers wanting to teach philosophy)
4. Any Usborne Book
5. The Mysteries of History - really fun to use for lessons
6. I think it is called Eyewitness (letters throughout American History)
7. Anything by Joe-
http://www.amazon.com/Enriching-Cur...60382911&sr=1-1&keywords=joseph+renzulliyou might be surprised if you give your child's teacher a resource, most teachers are not trained and feel like they have no clue when it comes to your gifted child. Also, unfortunately a lot of teachers fake it, just speaking as a trainer.