Erikson Institute, Loyola University, Chicago. School of Education, Loyola University, Chicago. Dept. of Psychology, Piaget, J., & Piers, M. W. (1972). Play and development: A symposium. Norton.
Čikaški stil citiranja (17. izdanje)Erikson Institute, Chicago. School of Education Loyola University, Chicago. Dept. of Psychology Loyola University, Jean Piaget, i Maria W. Piers. Play and Development: A Symposium. New York: Norton, 1972.
MLA način citiranja (9. izdanje)Erikson Institute, et al. Play and Development: A Symposium. Norton, 1972.
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