Freeman, E., Freeman, E., Sierra, K., & Bates, B. (2004). Head First design patterns. O'Reilly ; Shroff publishers & distributors.
Cita Chicago Style (17a ed.)Freeman, Eric, Elisabeth Freeman, Kathy Sierra, y Bert Bates. Head First Design Patterns. Sebastopol, CA : New Delhi: O'Reilly ; Shroff publishers & distributors, 2004.
Cita MLA (8a ed.)Freeman, Eric, et al. Head First Design Patterns. O'Reilly ; Shroff publishers & distributors, 2004.
Precaución: Estas citas no son 100% exactas.