Não informado. (2002). California Journal of Mines and Geology. State of California, Department of Natural Resources, Division of Mines.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. California Journal of Mines and Geology. San Francisco, Calif: State of California, Department of Natural Resources, Division of Mines, 2002.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. California Journal of Mines and Geology. State of California, Department of Natural Resources, Division of Mines, 2002.
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