Não informado. (1939). Journal of the Institute of Petroleum. Institute of Petroleum.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of the Institute of Petroleum. London: Institute of Petroleum, 1939.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of the Institute of Petroleum. Institute of Petroleum, 1939.
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