APA (7 वां संस्करण) प्रशस्ति पत्र
Williams, M. (2009). The brittle thread of life: Backcountry people make a place for themselves in early America. Yale University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Williams, Mark. The Brittle Thread of Life: Backcountry People Make a Place for Themselves in Early America. New Haven: Yale University Press, 2009.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Williams, Mark. The Brittle Thread of Life: Backcountry People Make a Place for Themselves in Early America. Yale University Press, 2009.
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