APA (7 वां संस्करण) प्रशस्ति पत्र
Pilkey, O. H., & Pilkey-Jarvis, L. (2007). Useless arithmetic: Why environmental scientists can't predict the future. Columbia University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Pilkey, Orrin H., और Linda Pilkey-Jarvis. Useless Arithmetic: Why Environmental Scientists Can't Predict the Future. New York: Columbia University Press, 2007.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Pilkey, Orrin H., और Linda Pilkey-Jarvis. Useless Arithmetic: Why Environmental Scientists Can't Predict the Future. Columbia University Press, 2007.
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