Não informado. (2018). Petroleum Equipment and Services. Associated Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Petroleum Equipment and Services. Dallas, Tex: Associated Publishers, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Petroleum Equipment and Services. Associated Publishers, 2018.
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