Não informado. (1894). Geological literature added to the Geological Society's Library. Geological Society of London.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Geological Literature Added to the Geological Society's Library. London: Geological Society of London, 1894.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Geological Literature Added to the Geological Society's Library. Geological Society of London, 1894.
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