Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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