David A. Black - The well grounded Rubyist, 2009
Java, Ruby & Rails
Ruby Tutorial
El Universo
Optimizing for developer happiness
Moving the Needle: How SF Ruby Got to 18%
Ruby
Copyright © 2008 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Chapter 14 Introduction to Ruby.
Ruby On Rails
JRuby - Enterprise 2.0
The Joy Of Ruby
Ruby an overall approach
