Schneider, R. (2022). Hiking the Columbia River Gorge: A guide to the area's greatest hiking adventures (Fourth edition.). Falcon Guides.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSchneider, Russ. Hiking the Columbia River Gorge: A Guide to the Area's Greatest Hiking Adventures. Fourth edition. Essex, Connecticut: Falcon Guides, 2022.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSchneider, Russ. Hiking the Columbia River Gorge: A Guide to the Area's Greatest Hiking Adventures. Fourth edition. Falcon Guides, 2022.
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