Johnson, C. G. (1998). Common plants of the inland Pacific Northwest. USDA Forest Service, Pacific Northwest Region.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJohnson, Charles G. Common Plants of the Inland Pacific Northwest. [Portland, Or.]: USDA Forest Service, Pacific Northwest Region, 1998.
एमएलए (8वां संस्करण) प्रशस्ति पत्रJohnson, Charles G. Common Plants of the Inland Pacific Northwest. USDA Forest Service, Pacific Northwest Region, 1998.
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