1. The Audubon Illustrated Handbook of American Birds;Reilly,1968
2. Alabama Birds;Imhof,1962
3. A Biological Survey of Katmai National Monument. Smithsonian Misc;Cahalane;Coll.,1959
4. Childs, H. E., Jr. 1969 Birds and Mammals of the Pitmegea River Region, Cape Sabine, Northwestern Alaska. Univ. Alaska Biol. Papers No. 10.
5. The Birds of Alaska;Gabrielson,1959