Barell, J. (1980). Playgrounds of our minds. Teachers College Press.
Lua i Stíl Chicago (17ú heag.)Barell, John. Playgrounds of Our Minds. New York: Teachers College Press, 1980.
Lua MLA (9ú heag.)Barell, John. Playgrounds of Our Minds. Teachers College Press, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.