Não informado. (1982). Environmental Progress. American Institute of Chemical Engineers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Environmental Progress. New York: American Institute of Chemical Engineers, 1982.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Environmental Progress. American Institute of Chemical Engineers, 1982.
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