Não informado. (2001). Western oil and refining. Palmer Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Western Oil and Refining. Los Angeles, Calif: Palmer Publications, 2001.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Western Oil and Refining. Palmer Publications, 2001.
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