O’Reilly Media, 2001. - 230 pages. 1st Edition. ISBN-13: 978-0596002145.
Ruby is an object-oriented programming language developed for the purpose of
making programming both enjoyable and fast. With its easy-to-use interpreter,
easy-to-understand syntax, complete object-oriented functionality, and powerful
class libraries, Ruby has become a language that can be used in a broad range of
fields: from text processing and CGI scripts to professional, large-scale
programs.