I first released a free PDF edition of The Book Of Ruby back in 2009. Over the last six months I’ve been working on a new paperback edition for No Starch Press. This substantially revises the original text and expands the coverage to include Ruby 1.9 in addition to Ruby 1.8.
Download the code archive for the revised paperback edition of The Book Of Ruby from No Starch Press: http://www.nostarch.com/boruby.htm
Buy the paperback Book Of Ruby from Amazon (US)
Buy the paperback Book Of Ruby from Amazon (UK)