Amundson, C. J. (1940). History of the Willamette Valley and Cascade Mountain Wagon Road Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAmundson, Carroll John. History of the Willamette Valley and Cascade Mountain Wagon Road Company. [Eugene, Or, 1940.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAmundson, Carroll John. History of the Willamette Valley and Cascade Mountain Wagon Road Company. 1940.
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