1. A theory of play and fantasy;Bateson;American Psychiatric Association Research Reports II,1955
2. Reprinted in B. Bateson, Steps to an ecology of mind. New York: Chandler.
3. The message “This is play”;Bateson,1956
4. Reprinted in R. E. Herron & B. Sutton-Smith (Eds.), Child's play. New York: Wiley.
5. Black, B. (in press). Interactive pretense: Social and symbolic skills in preschool play groups. Merrill-Palmer Quarterly.