Não informado. (2002). California Journal of Mines and Geology. State of California, Department of Natural Resources, Division of Mines.
Chicago-referens (17:e uppl.)Não informado. California Journal of Mines and Geology. San Francisco, Calif: State of California, Department of Natural Resources, Division of Mines, 2002.
MLA-referens (8:e uppl.)Não informado. California Journal of Mines and Geology. State of California, Department of Natural Resources, Division of Mines, 2002.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.