Nelson, S. P., & Nelson, T. W. (1997). Umbrella guide to exploring the Columbia-Snake River inland waterway. Epicenter Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNelson, Sharlene P., और Ted W. Nelson. Umbrella Guide to Exploring the Columbia-Snake River Inland Waterway. Kenmore, WA: Epicenter Press, 1997.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNelson, Sharlene P., और Ted W. Nelson. Umbrella Guide to Exploring the Columbia-Snake River Inland Waterway. Epicenter Press, 1997.
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