Cita APA (7a ed.)
Koster, R. A Theory of Fun: For Game Design. Paraglyph.
Cita estilo Chicago (17a ed.)
Koster, Raph. A Theory of Fun: For Game Design. Scottsdale, EUA: Paraglyph.
Cita MLA (9a ed.)
Koster, Raph. A Theory of Fun: For Game Design. Paraglyph.
Precaución: Estas citas no son 100% exactas.