Cita APA (7a ed.)

Thomas, D., Fowler, C., & Hunt, A. (2005). Programming Ruby: The pragmatic programmers' guide (2nd ed.). Pragmatic Bookshelf.

Cita Chicago Style (17a ed.)

Thomas, David, Chad Fowler, y Andrew Hunt. Programming Ruby: The Pragmatic Programmers' Guide. 2nd ed. Raleigh, Carolina del Norte [etc.]: Pragmatic Bookshelf, 2005.

Cita MLA (9a ed.)

Thomas, David, et al. Programming Ruby: The Pragmatic Programmers' Guide. 2nd ed. Pragmatic Bookshelf, 2005.