Robbins, W. G., & Barber, K. (2011). Nature's Northwest: The North Pacific Slope in the twentieth century. University of Arizona Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRobbins, William G., और Katrine Barber. Nature's Northwest: The North Pacific Slope in the Twentieth Century. Tucson: University of Arizona Press, 2011.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRobbins, William G., और Katrine Barber. Nature's Northwest: The North Pacific Slope in the Twentieth Century. University of Arizona Press, 2011.
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