Cita APA

Freeman, E., Robson, E., Sierra, K., & Bates, B. (2004). Head First design patterns. O'Reilly.

Citación estilo Chicago

Freeman, Eric, Elisabeth Robson, Kathy Sierra, and Bert Bates. Head First Design Patterns. Beijing: O'Reilly, 2004.

Cita MLA

Freeman, Eric, et al. Head First Design Patterns. O'Reilly, 2004.