Não informado. (1894). Geological literature added to the Geological Society's Library. Geological Society of London.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Geological Literature Added to the Geological Society's Library. London: Geological Society of London, 1894.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Geological Literature Added to the Geological Society's Library. Geological Society of London, 1894.
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