Cita APA (7a ed.)

Freeman, E., Robson, E., Sierra, K., & Bates, B. (2020). Head first design patterns (2nd edition.). O'Reilly Media, Inc..

Cita Chicago Style (17a ed.)

Freeman, Eric, Elisabeth Robson, Kathy Sierra, y Bert Bates. Head First Design Patterns. 2nd edition. Beijing: O'Reilly Media, Inc., 2020.

Cita MLA (8a ed.)

Freeman, Eric, et al. Head First Design Patterns. 2nd edition. O'Reilly Media, Inc., 2020.