Freeman, E., Freeman, E., Sierra, K., & Bates, B. (2004). Head First design patterns. O'Reilly ; Shroff publishers & distributors.
Chicago Style (17th ed.) CitationFreeman, 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.) CitationFreeman, Eric, et al. Head First Design Patterns. O'Reilly ; Shroff publishers & distributors, 2004.
Warning: These citations may not always be 100% accurate.