Não informado. (1992). Water Environment Research. Water Environment Federation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Water Environment Research. Alexandria, Va: Water Environment Federation, 1992.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Water Environment Research. Water Environment Federation, 1992.
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