Barell, J. (1980). Playgrounds of our minds. Teachers College Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBarell, John. Playgrounds of Our Minds. New York: Teachers College Press, 1980.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBarell, John. Playgrounds of Our Minds. Teachers College Press, 1980.
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