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शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNatural Gas in Developing Countries: Evaluating the Benefits to the Environment. Washington, D.C: World Bank, 1993.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNatural Gas in Developing Countries: Evaluating the Benefits to the Environment. World Bank, 1993.
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