Não informado. (2009). Proceedings of the Annual Meeting. American Petroleum Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Proceedings of the Annual Meeting. New York: American Petroleum Institute, 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Proceedings of the Annual Meeting. American Petroleum Institute, 2009.
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