APA (7 वां संस्करण) प्रशस्ति पत्र
Attfield, R. (1991). The Ethics of Environmental Concern (2nd ed.). University of Georgia Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Attfield, Robin. The Ethics of Environmental Concern. 2nd ed. Athens, Ga.: University of Georgia Press, 1991.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Attfield, Robin. The Ethics of Environmental Concern. 2nd ed. University of Georgia Press, 1991.
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