Wassink, J. L. (1995). Birds of the Pacific Northwest mountains: The Cascade Range, the Olympic Mountains, Vancouver Island, and the Coast Mountains. Mountain Press Pub. Co..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWassink, Jan L. Birds of the Pacific Northwest Mountains: The Cascade Range, the Olympic Mountains, Vancouver Island, and the Coast Mountains. Missoula, Mont.: Mountain Press Pub. Co., 1995.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWassink, Jan L. Birds of the Pacific Northwest Mountains: The Cascade Range, the Olympic Mountains, Vancouver Island, and the Coast Mountains. Mountain Press Pub. Co., 1995.
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