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Growing Object-Oriented Software, Guided by Tests (Addison-Wesley Signature Series (Beck))

Steve Freeman

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

Sandi Metz

amazon.com
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Szymon Kaliski https://www.inkandswitch.com/end-user-programming/

Eloquent Ruby (Addison-Wesley Professional Ruby Series)

Russ Olsen

amazon.com
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Agile History: Kent Beck vs. Alan Cooper - Neil on Software

Neilneilonsoftware.com
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Jeff Sutherland Scrum