APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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