Downing, A. (1980). The region of the upper Columbia River and how I saw it. Ye Galleon Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDowning, Alfred. The Region of the Upper Columbia River and How I Saw It. Fairfield, Wash.: Ye Galleon Press, 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDowning, Alfred. The Region of the Upper Columbia River and How I Saw It. Ye Galleon Press, 1980.
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