Cita APA (7a ed.)

Fitzgerald, M. (2007). Learning Ruby (First edition.). O'Reilly.

Cita Chicago Style (17a ed.)

Fitzgerald, Michael. Learning Ruby. First edition. Sebastopol, California: O'Reilly, 2007.

Cita MLA (9a ed.)

Fitzgerald, Michael. Learning Ruby. First edition. O'Reilly, 2007.