Collar, N.J., M.J. Crosby, and A.J. Sattersfield. Birds to Watch 2: The World List of Threatened Birds. BirdLife Conservation Series 4. Cambridge, England: BirdLife International, 1994.
Collar, N.J., and S.N. Stuart. Threatened Birds of Africa and Related Islands: The ICBP/IUCN Red Data Book. 3d ed., pt. 1. Cambridge, England: International Council for Bird Preservation, and International Union for the Conservation of Nature and Natural Resources, 1985.
Collar, N.J., et al. Threatened Birds of the Americas: The ICBP/IUCN Red Data Book. 3d ed., pt. 2. Cambridge, England: International Council for Bird Preservation, 1992.
Day, David. Vanished Species. New York: Gallery Books, 1989.
Diamond, Antony W., Rudolf L. Schreiber, Walter Cronkite, and Roger Tory Peterson. Save the Birds. Boston: Houghton Mifflin, 1989.
Ehrlich, Paul R., David S. Dobkin, and Darrel Wheye. Birds in Jeopardy. Stanford: Stanford University Press, 1992.
Fuller, Errol. Extinct Birds. New York and Oxford: Facts on File Publications, 1987.
King, W.B. Endangered Birds of the World: The ICBP Bird Red Data Book. Washington, D. C.: Smithsonian Institution Press in cooperation with the International Council for Bird Preservation, 1981.