Other
Learn to Program (With Ruby)
A beginner's guide to computer programming using the Ruby programming language.
University of Michigan
University of Michigan: The Smalltalk Programming Language
A description of the Smalltalk programming language, including history and sample programs.
Wikimedia
Wikipedia: Ruby Programming Language
A Wikipedia description of the Ruby programming language.
Wikimedia
Wikipedia: Smalltalk Programming Language
A Wikipedia description of the Smalltalk programming language.