Cooper P. Beginning Ruby: From novice to professional

Apress, 2007. - 664 p. First Edition. ISBN: 978-1590597668Ruby is a fun toy. It’s also a serious programming language. Ruby is the jolly uncle who
keeps the kids entertained, but who puts in solid 12-hour days at the construction site
during the week. To hundreds of thousands of programmers, Ruby has become a good
friend, a trusted servant, and has revealed a new way of thinking about programming
and software development.
Like the guitar, it’s often claimed that Ruby is an easy language to learn and a hard
one to master.