NATIONAL PRODUCTIVITY COUNCIL. (1977). NATIONAL CONVENTION ON PRODUCTIVITY. NATIONAL PRODUCTIVITY COUNCIL.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNATIONAL PRODUCTIVITY COUNCIL. NATIONAL CONVENTION ON PRODUCTIVITY. NEW DELHI: NATIONAL PRODUCTIVITY COUNCIL, 1977.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNATIONAL PRODUCTIVITY COUNCIL. NATIONAL CONVENTION ON PRODUCTIVITY. NATIONAL PRODUCTIVITY COUNCIL, 1977.
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