Kupchella, C. I., & Kupchella, C. I. (1986). Environmental Science: Living Within System Of Nature / Charles E. Kupchella. Allyn and Bacon.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKupchella, Charles I., और Charles I. Kupchella. Environmental Science: Living Within System Of Nature / Charles E. Kupchella. Allyn and Bacon, 1986.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKupchella, Charles I., और Charles I. Kupchella. Environmental Science: Living Within System Of Nature / Charles E. Kupchella. Allyn and Bacon, 1986.
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