Sandi Metz

• Practical Object Oriented Design In Ruby
• 99 Bottles of OOP
• Practical Object-Oriented Design: An Agile Primer Using Ruby (2nd Edition)
• Practical Object-Oriented Design in Ruby
• Practical Object Oriented Design in Ruby
• Practical Object-Oriented Design
• Practical Object-Oriented Design: An Agile Primer Using Ruby (2nd Edition)