Não informado. (1947). Information Circular. State of California, Department of Natural Resources, Division of Mines.
Chicago-referens (17:e uppl.)Não informado. Information Circular. San Francisco, Calif: State of California, Department of Natural Resources, Division of Mines, 1947.
MLA-referens (8:e uppl.)Não informado. Information Circular. State of California, Department of Natural Resources, Division of Mines, 1947.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.