Donaldson, H. (1965). Coal. Published for the Nuffield Foundation by the Longmans/ Penguin Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDonaldson, H. Coal. London: Published for the Nuffield Foundation by the Longmans/ Penguin Books, 1965.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDonaldson, H. Coal. Published for the Nuffield Foundation by the Longmans/ Penguin Books, 1965.
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