1. The Code of Nomenclature and Check-list of North American Birds;American Ornithologists’ Union,1886
2. Check-list of North American Birds;American Ornithologists’ Union,1895
3. Mitochondrial DNA phylogeographic differentiation among avian populations and the evolutionary significance of subspecies;Avise;Auk,1992
4. Clines in the yellow-throats of western North America;Behle;Condor,1950