Fahey, J. (1990). Hecla: A century of western mining. University of Washington Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFahey, John. Hecla: A Century of Western Mining. Seattle: University of Washington Press, 1990.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFahey, John. Hecla: A Century of Western Mining. University of Washington Press, 1990.
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