India. Petroleum and Natural Gas, N. D. (2001). Indian petroleum and natural gas statistics: 1999-2000. The author.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रIndia. Petroleum and Natural Gas, New Delhi. Indian Petroleum and Natural Gas Statistics: 1999-2000. The author, 2001.
एमएलए (9वां संस्करण) प्रशस्ति पत्रIndia. Petroleum and Natural Gas, New Delhi. Indian Petroleum and Natural Gas Statistics: 1999-2000. The author, 2001.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.