Webber, B. (1991). Comprehensive index to Oregon trail diaries. Webb Research Group ; Distributed by Pacific Northwest Books Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWebber, Bert. Comprehensive Index to Oregon Trail Diaries. Medford, OR: Webb Research Group ; Distributed by Pacific Northwest Books Co., 1991.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWebber, Bert. Comprehensive Index to Oregon Trail Diaries. Webb Research Group ; Distributed by Pacific Northwest Books Co., 1991.
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