SmallTalk 80: The Language

This book contains all the theory of object orientation you will ever need. It clear, brilliantly ordered, and besides this, it's refined and exquisite to read. There is a high chance you will have a great time reading it, even if you have spent years programming in other object oriented languages but Smalltalk. I think it's also a "must" if you work with any object oriented language. The fact that it's been written 20 years ago it's unimportant for me, because this book addresses mostly theoretical issues regarding Object Orientation. So my humble advice is, if you want to really understand objects, know what a meta-class inherits from or what is a Behavior, and have fun on the way, read this book. Some old friends of mine used to say: "it is the only computing science book there is" :)

"Smalltalk/80 - The Languaje" is not only a clasical book, it's a very modern book. Most of the content is incredible actual and very funny to read.You can't say "I know Smalltalk" if you don't read it.