Não informado. (2020). Special Reports on the Mineral Resources of Great Britain. H. M. Stationery Office.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Special Reports on the Mineral Resources of Great Britain. London: H. M. Stationery Office, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Special Reports on the Mineral Resources of Great Britain. H. M. Stationery Office, 2020.
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