* American Ornithologists' Union (2000). «Forty-second supplement to the American Ornithologists' Union check-list of North American birds». The Auk 117 (3): 847-858. doi:10.1642/0004-8038(2000)117[0847:FSSTTA]2.0.CO | * American Ornithologists' Union (2000). «Forty-second supplement to the American Ornithologists' Union check-list of North American birds». The Auk 117 (3): 847-858. doi:10.1642/0004-8038(2000)117[0847:FSSTTA]2.0.CO |