ISENBERG, J. P., & JACOBS, J. E. (1982). Playthings as learning tools: A parents guide. John Wiley and Sons.

ISENBERG, Joan P., and Judith E. JACOBS. Playthings as Learning Tools: A Parents Guide. New York: John Wiley and Sons, 1982.

ISENBERG, Joan P., and Judith E. JACOBS. Playthings as Learning Tools: A Parents Guide. John Wiley and Sons, 1982.