APA (7th ed.) Citation

Salen, K., & Zimmerman, E. (2004). Rules of play: Game design fundamentals. MIT Press.

Chicago Style (17th ed.) Citation

Salen, Katie, and Eric Zimmerman. Rules of Play: Game Design Fundamentals. Cambridge, Mass.: MIT Press, 2004.

MLA (9th ed.) Citation

Salen, Katie, and Eric Zimmerman. Rules of Play: Game Design Fundamentals. MIT Press, 2004.