Enger, E. D., & Smith, B. F. (2006). Environmental science: A study of interrelationships (10th ed.). McGraw-Hill College.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEnger, Eldon D., और Bradley F. Smith. Environmental Science: A Study of Interrelationships. 10th ed. New York: McGraw-Hill College, 2006.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEnger, Eldon D., और Bradley F. Smith. Environmental Science: A Study of Interrelationships. 10th ed. McGraw-Hill College, 2006.
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