ENGER, E. (2004). Environmental science: A study of interrelationships ninth ed. McGraw Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रENGER, Eldon. Environmental Science: A Study of Interrelationships Ninth Ed. McGraw Hill, 2004.
एमएलए (8वां संस्करण) प्रशस्ति पत्रENGER, Eldon. Environmental Science: A Study of Interrelationships Ninth Ed. McGraw Hill, 2004.
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