Conkin, P. (2007). The state of the earth: Environmental challenges on the road to 2100. Universities Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रConkin, Paul. The State of the Earth: Environmental Challenges on the Road to 2100. Hyderabad: Universities Press, 2007.
एमएलए (9वां संस्करण) प्रशस्ति पत्रConkin, Paul. The State of the Earth: Environmental Challenges on the Road to 2100. Universities Press, 2007.
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