North Klaus. (1997). Environmental business management: An Introduction (2nd (revised).). International Labour Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNorth Klaus. Environmental Business Management: An Introduction. 2nd (revised). Geneva: International Labour Office, 1997.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNorth Klaus. Environmental Business Management: An Introduction. 2nd (revised). International Labour Office, 1997.
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