(2005). enviromental standards and competitiveness of key economic sectors. united nations.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEnviromental Standards and Competitiveness of Key Economic Sectors. new york: united nations, 2005.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEnviromental Standards and Competitiveness of Key Economic Sectors. united nations, 2005.
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