APA (7th ed.) Citation

Koster, R. (2005). A theory of fun for game design. Paraglyph Press.

Chicago Style (17th ed.) Citation

Koster, Raph. A Theory of Fun for Game Design. Scottsdale: Paraglyph Press, 2005.

MLA (9th ed.) Citation

Koster, Raph. A Theory of Fun for Game Design. Paraglyph Press, 2005.