↑Mayr, Ernst, and G. William Cottrell, eds. (1979) , Check-List of Birds of the World, vol. 1, Second Edition
↑ 4.04.1Banks, R. C., R. W. McDiarmid, A. L. Gardner, and W. C. Starnes (2003) , Checklist of Vertebrates of the United States, the U.S. Territories, and Canada
↑ 5.05.1Banks, R. C., R. W. McDiarmid, and A. L. Gardner (1987) Checklist of Vertebrates of the United States, the U.S. Territories, and Canada, Resource Publication, no. 166