APA (7th ed.) Citation

Thomas, D., & Hunt, A. (2001). Programming Ruby: The pragmatic programmer's guide. Addison-Wesley.

Chicago Style (17th ed.) Citation

Thomas, David, and Andrew Hunt. Programming Ruby: The Pragmatic Programmer's Guide. Boston: Addison-Wesley, 2001.

MLA (9th ed.) Citation

Thomas, David, and Andrew Hunt. Programming Ruby: The Pragmatic Programmer's Guide. Addison-Wesley, 2001.