The iBook for Dummies by David Pogue (1st edition, 2001) is still available used on ebay or other platforms. Later editions focus more on the white iBook series.
If you are looking for information about the technology of the clamshell iBook, you will be disappointed. Above all, the book provides an easy-to-understand introduction for beginners to Mac OS9 and its possibilities. However, this works well. There are a number of beautiful cartoons by Rich Tennant from the 5th wave series.