Authors: David Thomas and Andrew Hunt
Publisher: Addison-Wesley
ISBN: 0-201-71089-7
URL: www.pragmaticprogrammer.com/ruby/index.html
Price: $42.95 US
For more information on the Ruby language itself, you can go to www.ruby-lang.org and www.rubycentral.com or to the Ruby newsgroup at comp.lang.ruby. Parts of this book are also available on-line at its web site, www.pragmaticprogrammer.com/ruby/index.html.