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