Não informado. (2004). Fossil energy update. Energy Research and Development Administration, Technical Information Center.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Fossil Energy Update. Oak Ridge, Tenn: Energy Research and Development Administration, Technical Information Center, 2004.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Fossil Energy Update. Energy Research and Development Administration, Technical Information Center, 2004.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.