Buteo regalis

Bechard, M. J.; Schmutz, J. K. 1995. Ferruginous Hawk (Buteo regalis). In: Poole, A.; Gill, F. (ed.), The birds of North America, pp. 1-20. The Academy of Natural Sciences and The American Ornithologists' Union, Philadelphia and Washington, DC.

Dechant, J. A.; Sondreal, M. L.; Johnson, D. H.; Igl, L. D.; Goldade, C. M.; Zimmerman, A. L.; Euliss, B. R. 1999. Effects of management practices on grassland birds: Ferruginous Hawk.

IUCN. 2012. IUCN Red List of Threatened Species (ver. 2012.1). Available at: http://www.iucnredlist.org. (Accessed: 19 June 2012).

Rich, T.D.; Beardmore, C.J.; Berlanga, H.; Blancher, P.J.; Bradstreet, M.S.W.; Butcher, G.S.; Demarest, D.W.; Dunn, E.H.; Hunter, W.C.; Inigo-Elias, E.E.; Martell, A.M.; Panjabi, A.O.; Pashley, D.N.; Rosenberg, K.V.; Rustay, C.M.; Wendt, J.S.; Will, T.C. 2004. Partners in flight: North American landbird conservation plan. Cornell Lab of Ornithology, Ithaca, NY.