APA Citation

Zichermann, G., & Cunningham, C. (2011). Gamification by design: Implementing game mechanics in web and mobile apps. Sebastopol: O'Reilly.

Chicago Style Citation

Zichermann, Gabe, and Christopher Cunningham. Gamification By Design: Implementing Game Mechanics in Web and Mobile Apps. Sebastopol: O'Reilly, 2011.

MLA Citation

Zichermann, Gabe, and Christopher Cunningham. Gamification By Design: Implementing Game Mechanics in Web and Mobile Apps. Sebastopol: O'Reilly, 2011.

Warning: These citations may not always be 100% accurate.