Beebe, F. L. (1974). Field studies of the Falconiformes (vultures, eagles, hawks, and falcons) of British Columbia. British Columbia Provincial Museum.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBeebe, Frank L. Field Studies of the Falconiformes (vultures, Eagles, Hawks, and Falcons) of British Columbia. Victoria, B.C.: British Columbia Provincial Museum, 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBeebe, Frank L. Field Studies of the Falconiformes (vultures, Eagles, Hawks, and Falcons) of British Columbia. British Columbia Provincial Museum, 1974.
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