Learn to Program
   By Chris Pine; Pragmatic Bookshelf, 2006, ISBN 0976694042. Engaging beginner introduction to programming, via Ruby. Not only for Ruby newbies. Online version has live code samples, running input and output as a constant quality check; in English, Françai
   http://pine.fm/LearnToProgram/

Making Use of Ruby
   By Suresh Mahadevan; John Wiley & Sons, 2002, ISBN 047121972X. Hands-on full introduction, how to save much time, many real-world examples, how to move beyond examples to specific tasks, end-of-chapter reviews, exercises.
   http://www.wiley.com/WileyCDA/WileyTitle/productCd-047121972X.html

Programming Ruby: Ruby Tuesday
   Interview with Programming Ruby authors, The Pragmatic Programmers. Amazon.com.
   http://www.amazon.com/exec/obidos/tg/feature/-/99126/

Programming Ruby: The Pragmatic Programmer's Guide
   Full online HTML text at Ruby Central, with download link. [Open Content, Open Publication License]
   http://www.rubycentral.com/book/

Ruby Cookbook
   By Lucas Carlson, Leonard Richardson; O'Reilly, 2006, ISBN 0596523696. From data structures to algorithms to integrating with new technologies; when solving a problem, don't reinvent the wheel: look it up in here. O'Reilly Media.
   http://www.oreilly.com/catalog/rubyckbk/

Ruby Developer's Guide
   By Robert Feldt, Lyle Johnson, Michael Neumann; Syngress Media, 2002, ISBN 1928994644. By programmers; comprehensive, discusses Ruby's role in many real-world uses.
   http://www.syngress.com/catalog/?pid=1830

Ruby In A Nutshell
   By Yukihiro "Matz" Matsumoto; O'Reilly & Associates, 2001, ISBN 0596002149. By programmer, and Ruby creator; concise broad reference guide assumes reader knows programming. [O'Reilly & Associates]
   http://www.oreilly.com/catalog/ruby/

RubyBookList
   At Ruby Garden. Includes cancelled and non-English titles.
   http://wiki.rubygarden.org/Ruby/page/show/RubyBookList

Sams Teach Yourself Ruby in 21 Days
   By Mark Slagell; Sams Publishing, 2002, ISBN 0672322528. Introduction to language, originally addressed an early key constraint: a lack of quality English-language documentation.
   http://www.samspublishing.com/bookstore/product.asp?isbn=0672322528&rl=1

The Ruby Way
   By Hal Fulton; Sams Publishing, 2001, ISBN 0672320835. Assumes reader knows programming, by teacher and programmer, Uses code samples to focus on how to use Ruby for specific uses, alone or with other languages.
   http://www.samspublishing.com/bookstore/product.asp?isbn=0672320835&rl=1

The Ruby Way: What is Ruby?
   Brief article explains main aspects, by Hal Fulton.
   http://www.samspublishing.com/articles/article.asp?p=27359&rl=1

Why's (Poignant) Guide to Ruby
   An online Ruby book for beginning coders which reads like an illustrated novel.
   http://poignantguide.net/ruby/