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शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBHATNAGAR O P. EDUCATION AND COMMUNICTION FOR DEVELOPMENT. 2. DELHI BOMBAY: OXFORD UNIVERSITY PRESS, 1985.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBHATNAGAR O P. EDUCATION AND COMMUNICTION FOR DEVELOPMENT. 2. OXFORD UNIVERSITY PRESS, 1985.
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