Cutright, P. R. (1969). Lewis and Clark, pioneering naturalists. University of Illinois Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCutright, Paul Russell. Lewis and Clark, Pioneering Naturalists. Urbana: University of Illinois Press, 1969.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCutright, Paul Russell. Lewis and Clark, Pioneering Naturalists. University of Illinois Press, 1969.
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