1. Short-term student responses to classroom instruction;Andersen;The Elementary School Journal,1981
2. Play as a medium for learning and development: A handbook of theory and practice,1988
3. Qualitative research for education: An introduction to theory and methods;Bogdan,1992
4. Under five in Britain. Vol. 1. Oxford preschool research project;Bruner,1980
5. The ideas of work and play;Cohen;British Journal of Sociology,1953