Não informado. (1967). Water Pollution Control. Institute of Water Pollution Control.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Water Pollution Control. London: Institute of Water Pollution Control, 1967.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Water Pollution Control. Institute of Water Pollution Control, 1967.
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