Cunningham, W. P., & Cunningham, M. A. (2020). Principles of environmental science: Inquiry & applications (Ninth editon.). McGraw-Hill Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCunningham, William P., और Mary Ann Cunningham. Principles of Environmental Science: Inquiry & Applications. Ninth editon. New York, NY: McGraw-Hill Education, 2020.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCunningham, William P., और Mary Ann Cunningham. Principles of Environmental Science: Inquiry & Applications. Ninth editon. McGraw-Hill Education, 2020.
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