Cita APA (7th ed.)

Thomas, D., Fowler, C., & Hunt, A. (2009). Programming Ruby 1.9: The pragmatic programmers' guide. Pragmatic Bookshelf.

Cita Chicago (17th ed.)

Thomas, David, Chad Fowler, i Andrew Hunt. Programming Ruby 1.9: The Pragmatic Programmers' Guide. Raleigh, N.C: Pragmatic Bookshelf, 2009.

Cita MLA (9th ed.)

Thomas, David, et al. Programming Ruby 1.9: The Pragmatic Programmers' Guide. Pragmatic Bookshelf, 2009.