Ruby, R. H., & Brown, J. A. (1974). Ferryboats on the Columbia River, including the bridges and dams. Superior Pub. Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRuby, Robert H., और John A. Brown. Ferryboats on the Columbia River, Including the Bridges and Dams. Seattle: Superior Pub. Co., 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRuby, Robert H., और John A. Brown. Ferryboats on the Columbia River, Including the Bridges and Dams. Superior Pub. Co., 1974.
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