Não informado. (1968). Abstracts of Transportation and Storage. American Petroleum Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Abstracts of Transportation and Storage. New York: American Petroleum Institute, 1968.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Abstracts of Transportation and Storage. American Petroleum Institute, 1968.
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