O'Farrell, P. A. (1899). Butte: Its copper mines and copper kings. Printing House of J. A. Rogers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रO'Farrell, P. A. Butte: Its Copper Mines and Copper Kings. New York: Printing House of J. A. Rogers, 1899.
एमएलए (8वां संस्करण) प्रशस्ति पत्रO'Farrell, P. A. Butte: Its Copper Mines and Copper Kings. Printing House of J. A. Rogers, 1899.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.