Cunningham, W. P., & Cunningham, M. A. (2015). Environmental science: A global concern (Thirteenth edition.). McGraw-Hill Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCunningham, William P., और Mary Ann Cunningham. Environmental Science: A Global Concern. Thirteenth edition. New York, NY: McGraw-Hill Education, 2015.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCunningham, William P., और Mary Ann Cunningham. Environmental Science: A Global Concern. Thirteenth edition. McGraw-Hill Education, 2015.
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