Walls, L. D. (1995). Seeing new worlds: Henry David Thoreau and nineteenth-century natural science. University of Wisconsin Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWalls, Laura Dassow. Seeing New Worlds: Henry David Thoreau and Nineteenth-century Natural Science. Madison WI: University of Wisconsin Press, 1995.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWalls, Laura Dassow. Seeing New Worlds: Henry David Thoreau and Nineteenth-century Natural Science. University of Wisconsin Press, 1995.
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