Organisation for Economic Co-operation and Development, P. (1978). Steam coal: Prospects to 2000. OECD.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOrganisation for Economic Co-operation and Development, Paris. Steam Coal: Prospects to 2000. OECD, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्रOrganisation for Economic Co-operation and Development, Paris. Steam Coal: Prospects to 2000. OECD, 1978.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.