Angell, T. (1972). Birds of prey on the Pacific Northwest slope. Pacific search.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAngell, Tony. Birds of Prey on the Pacific Northwest Slope. Seattle: Pacific search, 1972.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAngell, Tony. Birds of Prey on the Pacific Northwest Slope. Pacific search, 1972.
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