Collins Guide to the Birds of Prey of Britain and Europe
The Great Gray Owl: Phantom of the Northern Forest
NERO, Robert W.
Manual of Neotropical Birds
Blake, Emmet Reid
Birds of Prey in Connecticut: A Guide to Finding and Understanding Hawks, Eagles, Vultures and Owls
Eagles, Hawks and Falcons of the World
BROWN, Leslie and Dean AMADON.
Pirates and Predators: The Piratical and Predatory Habits of Birds
Hawks, Eagles and Falcons of North America: Biology and Natural History
Johnsgard, Paul A.
Harrier, Hawk of the Marshes: The Hawk That Is Ruled by a Mouse
Raptors of Western North America
Wheeler, Brian K.; Economidy, John M.
Raptors of Mexico and Central America [Scratch & Dent]
Clark, William S.; N. John Schmitt
Birds of Prey of the West: A Field Guide
Wheeler, Brian K., Text and Illustrations
Birds of Prey of the East: A Field Guide