Umanskaya A. S. (1979) Novii Vid Pugacha (Bubo Longaevus) z Piznioneogenovikh Vikladiv Pivnichnogo Prichornomoria URSR, 776-780
Shufeldt R. W. Fossil birds from the Equus Beds of Oregon, American Naturalist 25, 818-821
Hay O. P. (1902), Bibliography and Catalogue of the Fossil Vertebrata of North America. Bulletin of the United States Geological Survey 179, 1-868
Gaillard C. (1908) Les oiseaux des phosphorites du Quercy [The birds from the Quercy phosphorites], Annales de l'Université de Lyon, nouvelle séries. 1. Sciences, Médecine 23, 1-178
Lambrecht K. (1933) Handbuch der Palaeornithologie, 1-1024
Schultz C. B., Howard E. B. (1935) The fauna of Burnet Cave, Guadalupe Mountains, New Mexico, Proceedings of the Academy of Natural Sciences of Philadelphia 87, 273-298
Clements J. F., Schulenberg T. S., et al (2017), The eBird/Clements checklist of birds of the world: v2017
Nomenclator Zoologicus. A list of the names of genera and subgenera in zoology from the tenth edition of Linnaeus, 1758 to the end of 2004. Digitised by uBio from vols. 1-9 of Neave (ed.), 1939-1996 plus supplementary digital-only volume. http://ubio.org/NomenclatorZoologicus (as at 2006)
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. 79.
Banks, Richard C., C. Cicero, J. L. Dunn, A. W. Kratter, P. C. Rasmussen, J. V. Remsen, Jr., et al., 2003: Forty-fourth supplement to the American Ornithologists' Union Check-list of North American Birds. The Auk, vol. 120, no. 3. 923-931.