American Psychological Association (APA) offers some books explaining ADHD to children.
Here is one article about a newer release (3rd edition of their original book,
Putting On The Brakes). The back cover shows it is intended for ages 8-13.
Here is APA's list of
books on ADHD, through Magination Press. They range from books made with very young children in mind to books for teens at college, and the list even includes a book especially for girls:
Attention, Girls! A Guide to Learn All About Your AD/HD.
There is a feature which allows you to "Start reading this book online", to allow you to see a bit of the content, style, and approach of the book(s) which you may be interested in.
A distinct advantage to providing your child with a book is that you may pre-read it prior to giving it to your child, and you will be familiar with what the books says. By contrast, if providing a child with an online website, even after a parent pre-reads it, there is no guarantee that the content will remain the same. Information could be changed, added, removed. New links to other resources could be added as well.
