Cita APA (7a ed.)

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.