Não informado. (1960). List of Bureau of Mines publications and articles with subject and author index. U.S. Department of the Interior, Bureau of Mines.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. List of Bureau of Mines Publications and Articles with Subject and Author Index. Washington: U.S. Department of the Interior, Bureau of Mines, 1960.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. List of Bureau of Mines Publications and Articles with Subject and Author Index. U.S. Department of the Interior, Bureau of Mines, 1960.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.