12 months books
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Programming Ruby (2nd edition): The Pragmatic Programmers' Guide by Dave Thomas, with Chad Fowler and Andy Hunt (O'Reilly)
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Agile Web Development with Rails 4 by Sam Ruby (PragProg)
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The RSpec Book: Behaviour-Driven Development with RSpec, Cucumber, and Friends by David Chelimsky, Dave Astels, Zach Dennis, Aslak Hellesøy, Bryan Helmkamp, Dan North (PragProg)
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Practical Object-Oriented Design in Ruby by Sandi Metz (site)
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Crafting Rails 4 Applications: Expert Practices for Everyday Rails Development by José Valim (PragProg)
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The Passionate Programmer: Creating a Remarkable Career in Software Development by Chad Fowler (PragProg)
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The Cucumber Book: Behaviour-Driven Development for Testers and Developers by Matt Wynne and Aslak Hellesøy (PragProg)
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EXCEPTIONAL RUBY by Avdi Grimm (site)
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Confident Ruby by Avdi Grimm (site)
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The Clean Coder: A Code of Conduct for Professional Programmers (Amazon)
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Metaprogramming Ruby 2: Program Like the Ruby Pros by Paolo Perrotta (PragProg)
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Refactoring: Improving the Design of Existing Code (Amazon)