Gulick, B. (2004). Steamboats on Northwest rivers: Before the dams. Caxton Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGulick, Bill. Steamboats on Northwest Rivers: Before the Dams. Caldwell, Idaho: Caxton Press, 2004.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGulick, Bill. Steamboats on Northwest Rivers: Before the Dams. Caxton Press, 2004.
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