• Ruby in a Nutshell
• The Well-Grounded Rubyist
• Beginning Ruby: From Novice to Professional
• Ruby Best Practices
• Head First Ruby
• Hello Ruby: Adventures in Coding
• Learn Ruby The Hard Way
• Metaprogramming Ruby 2
• why's (poignant) Guide to Ruby
• Professional Ruby on Rails
• Programming Ruby: The Pragmatic Programmers' Guide
• Rails AntiPatterns: Best Practice Ruby on Rails Refactoring
• Ruby by Example
• Ruby Cookbook
• Ruby Pocket Reference
• Ruby Under a Microscope: An Illustrated Guide to Ruby Internals
• Ruby on Rails 3 Tutorial
• Eloquent Ruby
• THE BOOK OF RUBY: A Hands-On Guide for the Adventurous
• Service-Oriented Design with Ruby and Rails