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Programming Ruby
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<h2 id="external-links">External links</h2> <ul><li><a href="http://ruby-doc.org/docs/ProgrammingRuby/">First edition</a> (for online reading) at RUBY-DOC.ORG</li> <li><a href="https://pragprog.com/titles/ruby4/programming-ruby-1-9-2-0-4th-edition/">4th edition at The Pragmatic Programmers</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Black, David. "David Black on the Success of Ruby". <a href="http://www.infoq.com/interviews/david-black" target="_blank">http://www.infoq.com/interviews/david-black</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>