Debian -- Documentation
Anything you really need for Debian can be downloaded.
"Debian GNU/Linux Reference Card
The 101 most important things when using Debian GNU/Linux"
Debian GNU/Linux Desktop Survival Guide
"Rute User's Tutorial and Exposition"
The above should be more than enough reading to cover pretty much anything you need to know in order to run Debian GNU/Linux, or any other distro for that matter.
If you really must have hardcopy, I would suggest The Debian Bible and Rute, both can be bought at Amazon.