Koster, R. (2005). A theory of fun for game design. Paraglyph Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKoster, Raph. A Theory of Fun for Game Design. Scottsdale: Paraglyph Press, 2005.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKoster, Raph. A Theory of Fun for Game Design. Paraglyph Press, 2005.
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