Não informado. (1947). Information Circular. State of California, Department of Natural Resources, Division of Mines.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Information Circular. San Francisco, Calif: State of California, Department of Natural Resources, Division of Mines, 1947.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Information Circular. State of California, Department of Natural Resources, Division of Mines, 1947.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.