References
- Aristotle . Metaphysics
- Schneider , A. and Butcher , R. 1997 . Pre-Lusory Goals for Games: A Gambit Declined . Journal of the Philosophy of Sport , XXIV : 38 – 46 .
- Suits , B. 1978 . The Grasshopper: Games, Life and Utopia , Toronto : University of Toronto Press .