Cita APA (7a ed.)

Metz, S. (2019). Practical object-oriented design: An agile primer using Ruby (Second edition.). Addison-Wesley.

Cita Chicago Style (17a ed.)

Metz, Sandi. Practical Object-oriented Design: An Agile Primer Using Ruby. Second edition. Boston: Addison-Wesley, 2019.

Cita MLA (8a ed.)

Metz, Sandi. Practical Object-oriented Design: An Agile Primer Using Ruby. Second edition. Addison-Wesley, 2019.