Enger, E. D., & Smith, B. F. (2013). Environmental science: A study of interrelationships (Thirteenth edition.). McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEnger, Eldon D., और Bradley F. Smith. Environmental Science: A Study of Interrelationships. Thirteenth edition. New York, NY: McGraw-Hill, 2013.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEnger, Eldon D., और Bradley F. Smith. Environmental Science: A Study of Interrelationships. Thirteenth edition. McGraw-Hill, 2013.
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