Programming Ruby: A Pragmatic Programmer's Guide

Ruby Cookbook (Cookbooks (O'Reilly))

Intro To Ruby Programming: Beginners Guide Series

Ruby on Rails Tutorial: Learn Web Development with Rails (Addison-wesley Professional Ruby)

Ruby Programming for Beginners: An Introduction to Learning Ruby Programming with Tutorials and Hands-On Examples

Ruby on Rails For Dummies

Docker for Rails Developers: Build, Ship, and Run Your Applications Everywhere

The Cucumber Book: Behaviour-Driven Development for Testers and Developers

Cloning Internet Applications with Ruby

RubyMotion iOS Development Essentials