Ruby Language

Pragmatic Bookshelf

Programming Ruby 3.3: The Pragmatic Programmers Guide

O'Reilly

The Ruby Programming Language: Everything You Need to Know

Addison Wesley

Practical Object-Oriented Design: An Agile Primer Using Ruby

O'Reilly

Ruby Best Practices: Increase Your Productivity - Write Better Code

Addison Wesley

Learn Ruby the Hard Way: A Simple and Idiomatic Introduction to the Imaginative World of Computational Thinking With Code

Addison-Wesley Professional

Eloquent Ruby [Lingua inglese]                  

newhmapps

Learn Ruby language                              

Quick Start Guide Object Oriented Pocket Reference By Examples Concurrency Teach Yourself Code Book

Ruby Programming Language, Real World Code & Explanations, 2 Books in 1, For Beginners, Ruby Programming Book: Ruby Object Oriented Programming, Ruby Meta ... Learn Ruby by Examples (English Edition)

Ruby Languages: Discover The Languages That Ruby Is Coded In (English Edition)

Ruby

Ruby: Ruby (Japanese Edition)