Não informado. (1977). Water quality international. International Association on Water Pollution Research and Control.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Water Quality International. London: International Association on Water Pollution Research and Control, 1977.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Water Quality International. International Association on Water Pollution Research and Control, 1977.
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