Hummel, C. (1977). Education today for the world of tomorrow. Unesco.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHummel, Charles. Education Today for the World of Tomorrow. Paris: Unesco, 1977.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHummel, Charles. Education Today for the World of Tomorrow. Unesco, 1977.
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