Mauro,
I recently purchased a copy of the N Gardiner Book,  and whilst I used it
to learn about PICs I now refer straight to the datasheet.

I am not a beginner so prob should not have got a beginners book as it
was a little to chatty.
Anyhow, mail me and I could send you my book??  (fractal@xtra.co.nz)

Also a BIG thank you to everone who answered my query about the "F"lash
naming of devices.  Thank You.
Must go as am recovering from Hard-drive fail.