American Ornithologists Union. (1983). Check-list of North American birds: The species of birds of North America from the Artic through Panama, inclunding the West Indies and Hawaiian Island (6. ed.). Kansas: American Ornithologists Union.

American Ornithologists Union. Check-list of North American Birds: The Species of Birds of North America From the Artic Through Panama, Inclunding the West Indies and Hawaiian Island. 6. ed. Kansas: American Ornithologists Union, 1983.

American Ornithologists Union. Check-list of North American Birds: The Species of Birds of North America From the Artic Through Panama, Inclunding the West Indies and Hawaiian Island. 6. ed. Kansas: American Ornithologists Union, 1983.