Ray, D. K. (2007). Down the Colorado: The story of John Wesley Powell, the one-armed explorer. Francis Foster Books/Farrar, Straus and Giroux.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRay, Deborah Kogan. Down the Colorado: The Story of John Wesley Powell, the One-armed Explorer. New York: Francis Foster Books/Farrar, Straus and Giroux, 2007.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRay, Deborah Kogan. Down the Colorado: The Story of John Wesley Powell, the One-armed Explorer. Francis Foster Books/Farrar, Straus and Giroux, 2007.
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