Flanagan, D., & Matsumoto, Y. [ca. 2008]. The Ruby programming language : [covers Ruby 1.8 and 1.9]. In Everything you need to know (. 1. ed.. Aufl.) [Book]. Beijing [u.a.]: O’Reilly.

FLANAGAN, David und MATSUMOTO, Yukihiro, 2008. The Ruby programming language : [covers Ruby 1.8 and 1.9]. . 1. ed. Beijing [u.a.]: O’Reilly. ISBN 0596516177.

Flanagan, D., und Y. Matsumoto. „The Ruby programming language : [covers Ruby 1.8 and 1.9]“. Everything you need to know, . 1. ed. Aufl., book, O’Reilly, 2008.

Flanagan, David/Matsumoto, Yukihiro: The Ruby programming language : [covers Ruby 1.8 and 1.9], . 1. ed. Aufl. Beijing [u.a.] 2008.

Flanagan, D. und Matsumoto, Y. (2008), The Ruby programming language : [covers Ruby 1.8 and 1.9], Everything you need to know, . 1. ed.. Aufl., Bd. , O’Reilly, Beijing [u.a.].