Yes its the book from here:
http://store.slackware.com/cgi-bin/store

Thanks for the answer btw.

Hi, i noticed reading that slackware packages are fully compatible with salix.
Just a short question...

Is this the same for any slackware related guide or tutorial? I am thinking of purchasing the official slackware handbook, and would like to know if "most" contents of the book will be compatible ...