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Learn to Program (Facets of Ruby)

Ruby In A Day: Learn The Basics, Learn It Quick, Start Coding Fast (In A Day Books Book 3)

A Smarter Way to Learn JavaScript: The new approach that uses technology to cut your effort in half

Learn Ruby on Rails (Capstone Tutorials Book 1)

Practical Object-Oriented Design in Ruby: An Agile Primer (Addison-Wesley Professional Ruby Series)