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Ruby: Learn Ruby in 24 Hours or Less - A Beginner’s Guide To Learning Ruby Programming Now (Ruby, Ruby Programming, Ruby Course)
Eloquent Ruby (Addison-Wesley Professional Ruby Series)
Ruby on Rails Tutorial: Learn Web Development with Rails (Addison-Wesley Professional Ruby Series)
Ruby Cookbook: Recipes for Object-Oriented Scripting
Head First Ruby: A Brain-Friendly Guide
Learning Python: Powerful Object-Oriented Programming
Docker: Up & Running: Shipping Reliable Containers in Production