Tyer, B. (2012). Opportunity, Montana: Big copper, bad water, and the burial of an American landscape. Beacon Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTyer, Brad. Opportunity, Montana: Big Copper, Bad Water, and the Burial of an American Landscape. Boston, Massachusetts: Beacon Press, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTyer, Brad. Opportunity, Montana: Big Copper, Bad Water, and the Burial of an American Landscape. Beacon Press, 2012.
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