Eloquent Ruby (Addison-Wesley Professional Ruby Series)

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

The Rails 4 Way (Addison-Wesley Professional Ruby Series)

The Ruby Way: Solutions and Techniques in Ruby Programming (Addison-Wesley Professional Ruby Series)

The Ruby Programming Language: Everything You Need to Know

Metaprogramming Ruby 2: Program Like the Ruby Pros (Facets of Ruby)

Confident Ruby: 32 Patterns for Joyful Coding

Agile Web Development with Rails 5

Eloquent JavaScript: A Modern Introduction to Programming