APA-čujuhus (7. p.)
Koster, R. (2005). A theory of fun for game design. Paraglyph Press.
Chicago-čujuhus (17. p.)
Koster, Raph. A Theory of Fun for Game Design. Scottsdale, AZ: Paraglyph Press, 2005.
MLA-čujuhus (9. p.)
Koster, Raph. A Theory of Fun for Game Design. Paraglyph Press, 2005.
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