Davis, J. L. (2009). The Northwest nature guide: Where to go and what to see month by month in Oregon, Washington, and British Columbia. Timber Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDavis, James L. The Northwest Nature Guide: Where to Go and What to See Month by Month in Oregon, Washington, and British Columbia. Portland, Or.: Timber Press, 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDavis, James L. The Northwest Nature Guide: Where to Go and What to See Month by Month in Oregon, Washington, and British Columbia. Timber Press, 2009.
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