Não informado. (1947). Information Circular. State of California, Department of Natural Resources, Division of Mines.
Chicago-Zitierstil (17. Ausg.)Não informado. Information Circular. San Francisco, Calif: State of California, Department of Natural Resources, Division of Mines, 1947.
MLA-Zitierstil (8. Ausg.)Não informado. Information Circular. State of California, Department of Natural Resources, Division of Mines, 1947.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.