Preston, R. N. (1972). Historical Oregon: Overland stage routes, old military roads, Indian battle grounds, old forts, old gold mines. Western Guide Pub..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPreston, Ralph N. Historical Oregon: Overland Stage Routes, Old Military Roads, Indian Battle Grounds, Old Forts, Old Gold Mines. Corvallis, Or.: Western Guide Pub., 1972.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPreston, Ralph N. Historical Oregon: Overland Stage Routes, Old Military Roads, Indian Battle Grounds, Old Forts, Old Gold Mines. Western Guide Pub., 1972.
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