Hughes, J. L. (1962). Programed instruction for schools and industry. Science Research Associates.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHughes, John Leo. Programed Instruction for Schools and Industry. Chicago: Science Research Associates, 1962.
एमएलए (9वां संस्करण) प्रशस्ति पत्रHughes, John Leo. Programed Instruction for Schools and Industry. Science Research Associates, 1962.
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