Wilson, C. L. (1970). Coal-Bridge to the Future, report of the world coal study. Ballinger Pub. Co.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilson, Carroll L. Coal-Bridge to the Future, Report of the World Coal Study. Ballinger Pub. Co, 1970.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWilson, Carroll L. Coal-Bridge to the Future, Report of the World Coal Study. Ballinger Pub. Co, 1970.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.