Abbott, C., Adler, S., & Abbott, M. P. (1997). Planning a new West: The Columbia River Gorge National Scenic Area. Oregon State University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAbbott, Carl, Sy Adler, और Margery Post Abbott. Planning a New West: The Columbia River Gorge National Scenic Area. Corvallis, Or.: Oregon State University Press, 1997.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAbbott, Carl, et al. Planning a New West: The Columbia River Gorge National Scenic Area. Oregon State University Press, 1997.
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