Referencias
Austing, G. R., and J. B. Hold. 1966. The world of the great horned owl. Lippincott, Philadelphia.
Bent, A. C. 1938. Life histories of North American birds of prey. Part 2. Smithsonian Institution, U.S. National Museum Bulletin 70.
Craighead, J. J., and F. C. Craighead. 1956. Hawks, owls and wildlife. The Stackpole Co., Harrisburg.
Errington, P. L., F. Hamerstrom, and F. N. Hamerstrom. 1940. The great horned owl and its prey in north- central United States. Iowa State College. Agricultural Experiment Station Research Bulletin 277:757 850.
Heinrich, B. 1987. One man's owl. Princeton University Press, Princeton. Johnsgard, P. 1988. North American owls. Smithsonian Institution Press, Washington, D.C.
McInvaille, W. B., and L. B. Keith. 1974. Predator prey relations and breeding biology of the Great Horned Owl and Red-tailed Hawk in central Alberta. Canadian Field-Naturalist 88(1):1-20.
Sparks, J., and T. Soper. 1970. Owls, their natural and unnatural history. Taplinger Publishing Company, New York.
Tyler, H. A., and D. Phillips. 1978. Owls by day and night. Naturegraph Publishers, Happy Camp, CA.
Voous, K. H. 1988. Owls of the Northern Hemisphere. Collins, London.
Welty, J. C. 1982. The Life of Birds, 3rd ed. Saunders College Publishing, Philadelphia, 754 pp.
Recursos del web