I absolutely have to begin to have a precise idea of how to think Drupal 5.x.

Not being a programmer, I need something that does not give for granted concepts. What of these books do you recommend?

http://www.amazon.com/Using-Drupal-Angela-Byron/dp/0596515804/ref=pd_bbs...

http://www.amazon.com/Understanding-Drupal-Jeff-Robbins/dp/B001GXCVWK/re...

thanks