Não informado. (1972). Ecological Research Series. U.S. Environmental Protection Agency.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Ecological Research Series. Washington: U.S. Environmental Protection Agency, 1972.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Ecological Research Series. U.S. Environmental Protection Agency, 1972.
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