Cita APA (7a ed.)

Koster, R. (2013). A theory of fun for game design (2nd ed.). O´Reilly.

Cita Chicago Style (17a ed.)

Koster, Raph. A Theory of Fun for Game Design. 2nd ed. California: O´Reilly, 2013.

Cita MLA (8a ed.)

Koster, Raph. A Theory of Fun for Game Design. 2nd ed. O´Reilly, 2013.