Bishop, E. M. (2003). In search of ancient Oregon: A geological and natural history. Timber Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBishop, Ellen Morris. In Search of Ancient Oregon: A Geological and Natural History. Portland, Or.: Timber Press, 2003.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBishop, Ellen Morris. In Search of Ancient Oregon: A Geological and Natural History. Timber Press, 2003.
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