Hill, C. C. (1958). Spring flowers of the lower Columbia Valley. University of Washington Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHill, Clara Chapman. Spring Flowers of the Lower Columbia Valley. Seattle: University of Washington Press, 1958.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHill, Clara Chapman. Spring Flowers of the Lower Columbia Valley. University of Washington Press, 1958.
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