Robertson, R. G. (2012). Competitive struggle: America's western fur trading posts, 1764-1865 (2nd ed.). Caxton Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRobertson, R. G. Competitive Struggle: America's Western Fur Trading Posts, 1764-1865. 2nd ed. Caldwell, Idaho: Caxton Press, 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRobertson, R. G. Competitive Struggle: America's Western Fur Trading Posts, 1764-1865. 2nd ed. Caxton Press, 2012.
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