The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.

References

• American Ornithologists's Union. 1998. Check-List of North American Birds (The Species of Birds of North America from the Arctic through Panama, Including the West Indies and Hawaiian Islands). 7th.ed.. Allen Press, Inc., Lawrence, Kansas, U.S.A..
• Beletsky, L. 1998. Costa Rica: The Ecotraveller's Wildlife Guide. San Diego: Academic Press.
• Belize Zoo, T. 2000. "Keel-billed Toucan" (On-line). Accessed October 8, 2000 at http://www.belizezoo.org/zoo/zoo/birds/tou/tou1.html.
• BirdLife International 2009. Ramphastos sulfuratus
• Campos, R.G. 1989. Lista de las Aves de la Reserva Biológica Lomas Barbudal, Cantón de Bagaces, Guanacaste. Español/Inglés. Publicado por Amigos de Lomas Barbudal. 4 p.
• Campos, R.G. 1989. Notas de campo sobre aves en diferentes sitios del país. Grecia, Costa Rica. 4p.
• Chaves, A. 1988. Inventario Biológico de la Zona Norte. Informe Final, Consultoría realizada para el Centro Agronómico Cantonal de Upala. Organización para Estudios Tropicales. San José, Costa Rica. 180 p.
• Delgado, R.; R.G. Campos; J. Sánchez y Ch. Gómez. 1998. Lista de Aves de Costa Rica/ Checklist of Costa Rican Birds. ASOCIACION ORNITOLOGICA DE COSTA RICA. San José. Costa Rica. 28 p..
• Elizondo, L.H. 1991. Inventario de especies de aves de la Escuela de Agricultura de la Región Tropical Húmeda (EARTH). Guácimo, Limón, Costa Rica.. Consultoría realizada para Clemson University. 7 p.
• Emerald Forest Birds, "Keel-billed Toucan" (On-line). Accessed September 30, 2004 at http://www.emeraldforestbirds.com/keelbill2.htm.
• Enchantedlearning.com, 1999. "Keel-billed Toucan" (On-line). Accessed October 8, 2000 at http://www.enchantedlearning.com/subjects/birds/printouts/Toucancoloring.shtml.
• Gill, Frank, and Minturn Wright. 2006. Birds of the World: Recommended English Names. ix + 259
• Greer, E. 1993. "Keel-billed Toucan" (On-line). Accessed October 8, 2000 at http://www.ambergriscaye.com/birds/toucan.html.
• Kricher, J. 1989. A Neotropical Companion: An Introduction to the Animals, Plants and Ecosystems of the New World Tropics.
• Lewis, T.J. & F.G. Stiles.1980. Locational checklist of the birds of Costa Rica. Costa Rica Expeditions. San José, Costa Rica.
• Remsen, J., M. Hyde, A. Chapman. 1993. The diets of neotropical trogons, motmots, barbets, and toucans. The Condor, 95: 178-182.
• Sibley, Ch. and B. Monroe, Jr.. 1990. Distribution and Taxonomy of Birds of the World. Yale University Press. New Haven & London. 1111 p.
• Slud, P. 1960. The birds of Finca La Selva, Costa Rica: A tropical wet forest locality. Bulletin of the American Museum of Natural History 121(2): 146 p.
• Slud, P. 1964. The birds of Costa Rica: Distribution and Ecology. Bulletin of The American Museum of Natural History 128: 5-430
• Snow, B. 1977. Territorial behavior and courtship of the male Three-wattled bellbird. The Auk 94(4): 623-45.
• Stiles, F.G. & A. F.Skutch. 1995. Guía de Aves de Costa Rica.Traducción al Español: Loretta Rosselli. Ilustrado por Dana Gardner. Instituto Nacional de Biodiversidad (INBio). Heredia, Costa Rica. 580 p.
• Stiles, F.G. 1977. Checklist of the birds of La Selva and vicinity. Universidad de Costa Rica. San José, Costa Rica. 12 p.
• Stiles, F.G. 1983. Checklist of birds. Pp. 530-544, In: D.H. Janzen (ed.). Costa Rican Natural History. University of Chicago Press, Chicago.
• Stiles, F.G. 1985. Conservation of forest birds in Costa Rica: Problems and perspectives. ICBP Technical Publication 4: 141-168.
• Stiles, F.G. 1991. Forest Birds - Caribbean slope. s.d. 7 p. (BORRADOR).
• Thurman, J. 1999. "Keel-billed Toucan" (On-line). Accessed October 8, 2000 at http://whozoo.org/students/jenthu/toucan.html.