脚注
- ^ Salen, Katie & Zimmerman, Eric (2003), Rules of Play: Game Design Fundamentals, MIT Press, p. 80, ISBN 0-262-24045-9
- ^ Costikyan, Greg (1994), I Have No Words & I Must Design. 2008-08-17 閲覧。
- ^ Avedon, Elliot & Sutton-Smith, Brian (1971), The Study of Games, J. Wiley, p. 405, ISBN 0471038393