ISENBERG, J. P., & JACOBS, J. E. (1982). Playthings as learning tools: A parents guide. John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)ISENBERG, Joan P., agus Judith E. JACOBS. Playthings as Learning Tools: A Parents Guide. New York: John Wiley and Sons, 1982.
Lua MLA (9ú heag.)ISENBERG, Joan P., agus Judith E. JACOBS. Playthings as Learning Tools: A Parents Guide. John Wiley and Sons, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.