APA (7th ed.) Citation

Freeman, E., Robson, E., Sierra, K., & Bates, B. (2004). Head First design patterns (1st edition.). O'Reilly.

Chicago Style (17th ed.) Citation

Freeman, Eric, Elisabeth Robson, Kathy Sierra, and Bert Bates. Head First Design Patterns. 1st edition. Sebastopol, California: O'Reilly, 2004.

MLA (9th ed.) Citation

Freeman, Eric, et al. Head First Design Patterns. 1st edition. O'Reilly, 2004.