Cita APA (7a ed.)

Freeman, E., & Robson, E. (2021). Head first design patterns: Building extensible and maintainable object-oriented software (2nd edition.). O'Reilly.

Cita Chicago Style (17a ed.)

Freeman, Eric, y Elisabeth Robson. Head First Design Patterns: Building Extensible and Maintainable Object-oriented Software. 2nd edition. Sebastopol, California: O'Reilly, 2021.

Cita MLA (9a ed.)

Freeman, Eric, y Elisabeth Robson. Head First Design Patterns: Building Extensible and Maintainable Object-oriented Software. 2nd edition. O'Reilly, 2021.