Wright, R. T., & Nebel, B. J. (2002). Environmental science: Toward a sustainable future (Eighth edition.). Pearson Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWright, Richard T., और Bernard J. Nebel. Environmental Science: Toward a Sustainable Future. Eighth edition. Upper Saddle River, New Jersey: Pearson Education, 2002.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWright, Richard T., और Bernard J. Nebel. Environmental Science: Toward a Sustainable Future. Eighth edition. Pearson Education, 2002.
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