APA (7 वां संस्करण) प्रशस्ति पत्र

Enger, E. D., & Smith, B. F. (2010). Environmental science: A study of interrelationships (Twelth edition.). McGraw-Hill Higher Education.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Enger, Eldon D., और Bradley F. Smith. Environmental Science: A Study of Interrelationships. Twelth edition. New York: McGraw-Hill Higher Education, 2010.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Enger, Eldon D., और Bradley F. Smith. Environmental Science: A Study of Interrelationships. Twelth edition. McGraw-Hill Higher Education, 2010.