Não informado. (1991). International Journal of Environment and Pollution. Inderscience Enterprises.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. International Journal of Environment and Pollution. Geneva, Suíça: Inderscience Enterprises, 1991.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. International Journal of Environment and Pollution. Inderscience Enterprises, 1991.
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