Não informado. (2017). The Petroleum Engineer. Petroleum Engineer Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. The Petroleum Engineer. Dallas, Tex: Petroleum Engineer Publishing, 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. The Petroleum Engineer. Petroleum Engineer Publishing, 2017.
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