Spence, C. C. (1970). Mining engineers & the American West: The lace-boot brigade, 1849-1933. Yale University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpence, Clark C. Mining Engineers & the American West: The Lace-boot Brigade, 1849-1933. New Haven: Yale University Press, 1970.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSpence, Clark C. Mining Engineers & the American West: The Lace-boot Brigade, 1849-1933. Yale University Press, 1970.
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