Kumar, G. W. W. a. R. Options for developing countries in mining development. Macmillan Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKumar, Grantley W. Walrond and Raj. Options for Developing Countries in Mining Development. Macmillan Press.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKumar, Grantley W. Walrond and Raj. Options for Developing Countries in Mining Development. Macmillan Press.
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