Oregon. Department of Geology and Mineral Industries, Western Guide Publishers, & Preston, R. N. (1975). Oregon gold & gems maps: Then & now. Western Guide Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रOregon. Department of Geology and Mineral Industries, Western Guide Publishers, और Ralph N. Preston. Oregon Gold & Gems Maps: Then & Now. Corvallis [Or.]: Western Guide Publishers, 1975.
एमएलए (8वां संस्करण) प्रशस्ति पत्रOregon. Department of Geology and Mineral Industries, et al. Oregon Gold & Gems Maps: Then & Now. Western Guide Publishers, 1975.
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