Read things like this testimony to Smalltalk by a formerly rigid language aficianado.
Me being a statically typed language guy at the time thought the numbers were a bunch of BS. I actually learned Smalltalk to prove to myself the numbers were wrong. After learning Smalltalk and using it in my spare time for over a year I came to the conclusion that I don't like Java, or C++.Then read things like this effort to bring computer textbook customization into the 21st century.
And wind it up with a search on that site for a Smalltalk text to include in a custom textbook. But...
...a search on the site leads to zero Smalltalk textbooks. (Plenty of Java, C#, and Extreme Programming texts that *refer* to Smalltalk, though.)