APA (7th ed.) Citation

Freeman, E., Freeman, E., Sierra, K., & Bates, B. (2004). Head First design patterns. O'Reilly ; Shroff publishers & distributors.

Chicago Style (17th ed.) Citation

Freeman, Eric, Elisabeth Freeman, Kathy Sierra, and Bert Bates. Head First Design Patterns. Sebastopol, CA : New Delhi: O'Reilly ; Shroff publishers & distributors, 2004.

MLA (8th ed.) Citation

Freeman, Eric, et al. Head First Design Patterns. O'Reilly ; Shroff publishers & distributors, 2004.