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Jason Fried It Doesn't Have to Be Crazy at Work

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The Unicorn Project

Gene Kim

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

Sandi Metz

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Jason Fried It Doesn't Have to Be Crazy at Work

David Thomas The Pragmatic Programmer

David Heinemeier Hansson Rework