References
- Herrigel, E. (1953) Zen in the Art of Archery. London: Routledge and Kegan Paul. Huizinga, J. (1949) Homo Ludens: A study of the Play Element in Culture. London: Routledge and Kegan Paul Maslow, A. H. (1954) Motivation and Personality. New York: Harper and Row.
- Matterson, E. M. (1965) Play with a Purpose for Under-Sevens. Harmondsworth: Penguin.