↑Lope, Florentino de, and Eduardo da Silva (1988) La fidelidad al lugar de nidification o de nacimiento en al avion comun (Delichon urbica urbica L.) en Badajoz, Espana, Ardeola, vol. 35, no. 1
↑ 5.05.1Dickinson, Edward C., ed. (2003) , The Howard and Moore Complete Checklist of the Birds of the World, 3rd edition
↑Banks, 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
↑Banks, 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
↑ 8.08.1American Ornithologists' Union (2004) Forty-fifth supplement to the American Ornithologists' Union check-list of North American birds, The Auk, vol. 121, no. 3
