Chowdhury, P. N. (1973). Economics of research and development. People's Pub. House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रChowdhury, P. N. Economics of Research and Development. People's Pub. House, 1973.
एमएलए (9वां संस्करण) प्रशस्ति पत्रChowdhury, P. N. Economics of Research and Development. People's Pub. House, 1973.
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