APA (7th ed.) Citation

Perrotta, P. (2014). Metaprogramming Ruby 2: Program like the Ruby pros. Pragmatic Bookshelf.

Chicago Style (17th ed.) Citation

Perrotta, Paolo. Metaprogramming Ruby 2: Program like the Ruby Pros. Dallas [u.a.]: Pragmatic Bookshelf, 2014.

MLA (9th ed.) Citation

Perrotta, Paolo. Metaprogramming Ruby 2: Program like the Ruby Pros. Pragmatic Bookshelf, 2014.

Warning: These citations may not always be 100% accurate.