Webber, B. (1986). The Oregon Trail Memorial Half-Dollar (1926-1939). Webb Research Group : Distributed by Pacific Northwest Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWebber, Bert. The Oregon Trail Memorial Half-Dollar (1926-1939). Medford, OR: Webb Research Group : Distributed by Pacific Northwest Books, 1986.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWebber, Bert. The Oregon Trail Memorial Half-Dollar (1926-1939). Webb Research Group : Distributed by Pacific Northwest Books, 1986.
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