Linux best guide / book
 

Hi,

which is best reference book for linux?

It depends on what you want to learn and which distribution you are running on your machine. Do you want to learn general system administration or do you want to learn systems/application programming or kernel programming? Please give more info on what you exactly want to accomplish.

As anand.armug said, it all depends on what you want to learn.

Basics - Linux For Dummies
Programming - Go to any local library and check in the computers section for a book on C++ or whatever you want to do.
Advanced - Google is your friend ;) You'll have to rely on the internet for this one cause not many people write books on
Linux.

Hope this helps :)

Try this URL: http://linuxtopia.org/

and also The Linux Documentation Project