Mathews, D. (1988). Cascade-Olympic natural history. Raven Editions in conjunction with the Audubon Society of Portland.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMathews, Daniel. Cascade-Olympic Natural History. Portland, OR: Raven Editions in conjunction with the Audubon Society of Portland, 1988.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMathews, Daniel. Cascade-Olympic Natural History. Raven Editions in conjunction with the Audubon Society of Portland, 1988.
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