A deserving classic, available for free online, with extras, at "http://mitpress.mit.edu/sicp/". ( )

The best book about the Scheme language, and therefore a very good introduction for any other functional language.
I mean a language where a function is like any other data type, that you can create and manipulate on the fly. ( )

A must read for anyone trying to understand computer science and not just computer engineering. ( )

every programmer should read this ( )