Looking for Book/DVD Recommendations for young poker students

[DCJ311]

Recently I have been teaching poker to an 8 year old and a 13 year old, based on their dad's interest in having them learn. They are both very smart, and already fairly proficient in sit and go's. What I'd like them to learn about is proper single table tournament strategy in no limit hold em.

I also want them to learn concepts of how to play differently when the game is 9 handed and when it is short handed. The DVD/books have to be fairly simple to understand and not highly mathematic in detail if possible.

Does anyone have any recommendations?