Yukihiro Matsumoto (Matsumoto, Yukihiro)

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  Ruby in a Nutshell
  by Yukihiro Matsumoto, David Flanagan
  Softcover, Oreilly & Associates Inc, ISBN 0596101244 (0-596-10124-4)
• 
  Ruby in a Nutshell: A Desktop Quick Reference
  by Yukihiro Matsumoto, David L. Reynolds
  Softcover, Oreilly & Associates Inc, ISBN 0596002149 (0-596-00214-9)
• 
  via
  The Ruby Programming Language
  by Yukihiro Matz Matsumoto, David Flanagan
  Softcover, Oreilly & Associates Inc, ISBN 0596516177 (0-596-51617-7)