The Ruby programming language

by David Flanagan, Yukihiro Matsumoto

Metaprogramming Ruby

by Paolo Perrotta

Ruby Programming for Beginners

by Tim Warren

Computer Science Programming Basics In Ruby

by Ophir Frieder

Metaprogramming Ruby 2: Program Like the Ruby Pros (Facets o...

by Paolo Perrotta

Programming Ruby

by Dave Thomas, Chad Fowler

Practical Object Oriented Design In Ruby

by Sandi Metz

Game Programming with Python, Lua, and Ruby (Game Developmen...

by Tom Gutschmidt

This book is unusual because it covers game programming in three different scripting languages in three separate section...

Ruby cookbook

by Lucas Carlson

Understanding Computation

by Tom Stuart

Eloquent Ruby

by Russ Olsen

Ruby in a nutshell

by Yukihiro Matsumoto, Eric Jacoboni

The Ruby Way

by Hal Fulton

Ruby programming for the absolute beginner

by Jerry Lee Ford

Ruby best practices

by Gregory T. Brown

Ruby on Rails tutorial

by Michael Hartl

Programming Ruby

by Dave Thomas, Andy Hunt

Ruby On Rails Bible

by Timothy Fisher

Learning Ruby (Learning)

by Michael Fitzgerald

Ruby Pocket Reference

by Michael Fitzgerald