Adams, Alexander B. "1812-1814", "1815-1818" John James Audubon: A Biography. Toronto: Longmans Canada Ltd., 1966, pp. 153-154, 165-166.
Bilby, Thomas. "The Washington Eagle" Younks Folks' Illustrated Book of Birds with many original and amusing anecdotes. New York: John Lovell, 188?, pp. 26-29.
Pearson, Gilbert T. "Order of Birds of Prey" Birds of America, v.2. Ed. Gilbert T. Pearson, New York: The University Society Inc., 1917, pp. 53-121.
Bent, Arthur Cleveland. "Eastern Pigeon Hawk" Life Histories of North American Birds of Prey, part 2 New York: Dover Publications Inc., 1938, pp. 70-83.
Forbush, Edward Howe; May, John Bichard. "Swainson's Hawk", "American Rough-Legged Hawk", "Turkey Vulture" "Marsh Hawk", "Burrowing Owl", "Saw-whet Owl", "Great Gray Owl", "Turkey Vulture", "Black Vulture", "Short-eared Owl", "Long-eared Owl", "Great Horned Owl", "Snowy Owl" A Natural History of American Birds of Eastern and Central North America New York: Bramhall House, 1955, pp. 112, 113, 94-95 119-121, 270-271, 278-279, 273-274, 94-95, 95-96, 274-275, 275-277, 265-267, 267-269.
Reilly, Edgar M. "American Vultures" "Hawks, Old World Vultures, and Harriers", "The Osprey" "Caracaras and Falcons", "The Typical Owls" The Audubon Illustrated Handbook of American Birds Ed. Olin Sewall Pettingill, Jr. New York: McGraw-Hill Book Company, 1968, pp. 90-91, 92-106, 107-108, 109-114, 241-251.
Weidensaul, Scott. The Raptor Almanac: Birds of Prey. New York: Lyons and Burford, Publishers. 1996.
Clark, William S. "Gray Hawk", "White-tailed Hawk", "Zone-tailed Hawk" A Field Guide to Hawks of North America Ed. Rodger Tory Peterson. Boston: Houghton Mifflin Company, 1987, pp. 50-52, 64-67, 67-69.
Snyder, Noel and Helen. "Swainson's Hawk", "Aplomado Falcon" "Northern Harrier" Birds of Prey. Natural History and Conservation of North American Raptors Stillwater (MN): Voyageur Press, Inc., 1991, pp. 112-116, 182-188 67-70.
Palmer, Ralph Simon. "Aplomado Falcon", "White-tailed Hawk", "Zone-tailed Hawk". Handbook of North American Birds, v. 5 Diurnal Raptors New Haven: Yale University Press, 1988, pp. 315-322, 74-84, 85-95.
Palmer, Ralph Simon. "American Black Vulture", "Hook-billed Kite", "Bay-Winged Hawk", "White-tailed Eagle", "Lesser Black Hawk", "Gray Hawk", "King Vulture" Handbook of North American Birds, v. 4 Diurnal Raptors New Haven: Yale University Press, 1988, pp. 11-24, 102-107, 390-401, 238-247, 379-389, 402-410, 67-69.
U.S. Fish and Wildlife Service. "Bald Eagle (Endangered Species), Wildlife Species Information" Wildlife Species Information. July 1995 <http://www.fws.gov/r9extaff/biologues/bio%5Feagl.html> (June 12, 1998).
Macbride Raptor Project. "Peregrine Falcon" Falcons. 1997 <http://www.ai-design.com/stargig/raptor/global/content/report/PeregrineFalcon.html> {June 17, 1998)
United States Fish and Wildlife Service. "Peregrine Falcon". 1996. <http://www.fws.gov/r1srbo/outreach/peregrin.htm> (June 19, 1998).
United States Fish and Wildlife Service. "Peregrine Falcon (Endangered Species), Wildlife Species Information" Wildlife Species Information. July 1995. <http://www.fws.gov/r9extaff/biologues/bio%5Fpere.html> (June 19, 1998).
United States Fish and Wildlife Service. "Everglade Snail Kite", Species Accounts. February 1991. <http://www.fws.gov/r9endspp/i/b/sab0v.html> (June 30, 1998).
The Raptor Center. "Northern Harrier" Raptor Facts. <http://www.raptor.cvm.umn.edu/newwebdev/raptor/rfacts/nharr.html> (August 4, 1998).
Southeastern Raptor Rehabilitation Center. "Eastern Screech Owl" Natural Histories of Raptors. <http://www.vetmed.auburn.edu/raptor/history/screech.html> (August 5, 1998).
MacBride Raptor Project. "Great Gray Owl", Owls. 1997 <http://www.ai-design.com/stargig/raptor/global/content/report/GreatGrayOwl.html> (August 4, 1998)
MacBride Raptor Project. "Goshawk", Hawks. 1997 <http://www.ai-design.com/stargig/raptor/global/content/report/NorthernGoshawk.html> (July 7, 1998)
The Raptor Center. "American Kestrel" Raptor Facts. <http://www.raptor.cvm.umn.edu/newwebdev/raptor/rfacts/amkest.html> (June 28, 1998)
The Raptor Center. "Bald Eagle" Raptor Facts. <http://www.raptor.cvm.umn.edu/newwebdev/raptor/rfacts/bald.html> (June 12, 1998)
The Raptor Center. "Common Barn Owl" Raptor Facts. <http://www.raptor.cvm.umn.edu/newwebdev/raptor/rfacts/cbarno.html> (August 3, 1998)
The Raptor Center. "Boreal Owl" Raptor Facts. <http://www.raptor.cvm.umn.edu/newwebdev/raptor/rfacts/boreal.html> (August 4, 1998)
The Raptor Center. "Golden Eagle" Raptor Facts. <http://www.raptor.cvm.umn.edu/newwebdev/raptor/rfacts/golden.html> (June 15, 1998)
The Raptor Center. "Gyrfalcon" Raptor Facts. <http://www.raptor.cvm.umn.edu/newwebdev/raptor/rfacts/gyrfal.html> (June 28, 1998)
The Raptor Center. "Northern Goshawk" Raptor Facts. <http://www.raptor.cvm.umn.edu/newwebdev/raptor/rfacts/ngos.html> (July 7, 1998)
The Raptor Center. "Osprey" Raptor Facts. <http://www.raptor.cvm.umn.edu/newwebdev/raptor/rfacts/osprey.html> (July 10, 1998)
The Raptor Center. "Peregrine Falcon" Raptor Facts. <http://www.raptor.cvm.umn.edu/newwebdev/raptor/rfacts/peregri.html> (June 19, 1998)
Southeastern Raptor Rehabilitation Center. "Peregrine Falcon" Natural Histories of Raptors. <http://www.vetmed.auburn.edu/raptor/history/peregrin.htm> (June 19, 1998)