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

References

• 1. Walters, M. (1994) Eyewitness Handbooks: Birds Eggs. Dorling Kindersley, London.
• 2. Mullarney, K., Svensson, L., Zetterstrom, D., & Grant, P.J. (1999) Collins Bird Guide. HarperCollins Publishers Ltd, London.
• 3. BTO Breeding birds in the wider countryside (November 2002) http://www.bto.orgbirdtrends/wcrhousp.htm
• 4. Gooders, J. (1982) Collins British Birds. William Collins Sons and Co Ltd, London.
• 5. Lack, P. (1986) The Atlas of Wintering Birds in Britain and Ireland. T. & A. D. Poyser Ltd, Calton.
• 6. Greenoak, F. (1979) All the birds of the air. Book Club Associates, London.
• 7. Investigation of the Causes of the Decline of House Sparrow and Starling in Great Britain. Department for Environment, Food and Rural Affairs (DEFRA) (November 2002 http://www.defra.gov.ukwildlife-countryside/resprog/findings/sparrow/
• 8. House sparrows. BTO (November 2002) http://www.bto.orgappeals/house_sparrow.htm
• 9. RSPB (2003) Pers. comm.
• 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..
• Araya BM & G Millie. 1991. Guía de campo de las aves de Chile. 4ta ed. Editorial Universitaria, Santiago. 405 p.
• Azpiroz, A., Ascanio D., Restall R., Soto A., Bosque C., & Rodríguez-Ferraro A. (2006). Status and distribution of the House Sparrow (Passer domesticus) in Venezuela. Ornitología Neotropical. 17, 457-460.
• B., Bruun., & S. Baha El Din.   (1985).  Common Birds of Egypt, The American University in Cairo Press, Cairo..  
• Banks, R. C., R. W. McDiarmid, A. L. Gardner, and W. C. Starnes. 2003. Checklist of Vertebrates of the United States, the U.S. Territories, and Canada
• Banks, R. C., R. W. McDiarmid, and A. L. Gardner. 1987. Checklist of Vertebrates of the United States, the U.S. Territories, and Canada. Resource Publication, no. 166. 79
• BirdLife International 2009. Passer domesticus
• 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. Instituto Nacional de Biodiversidad. Heredia Costa Rica. 7 p.
• Gill, Frank, and Minturn Wright. 2006. Birds of the World: Recommended English Names. ix + 259
• John Terres (1980) The Audubon Society Encyclopedia of North American Birds. Knopf: New York.
• Kaufman, K. 1996. Lives of North American Birds, Houghton Mifflin, Boston.
• Lewis, T.J. & F.G. Stiles.1980. Locational checklist of the birds of Costa Rica. Costa Rica Expeditions. San José, Costa Rica.
• Lowther, Peter E. and Cink, Calvin L. 1992. The Birds of North America. No. 12. The American Ornithologists' Union.
• M., Tharwat.   (1997).  ‘Birds Known to occur in Egypt’, National Biodiversity Unit, no. 8, Egyptian Environmental Affairs Agency, Cairo..  
• Moller (2006) Sociality, age at first reproduction and senescence: comparative analyses of birds. J Evol Biol, 19:682-689.
• Monaghan and Metcalfe (2000) Genome size and longevity. Trends Genet, 16:331-332.
• Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2006. The Animal Diversity Web (online). Accessed February 16, 2011 at http://animaldiversity.org. http://www.animaldiversity.org
• R., Porter., & D. Cottridge.   (2000).  Birds of Egypt and the Middle East, The American University in Cairo Press, Cairo..  
• S., Baha El Din., J. Hobbs., W. Mullie., S. Goodman., & P. Meininger.   (1989).  The Birds of Egypt, Oxford University Press, New York..  
• Shuker, KPN. 2001. The Hidden Powers of Animals: Uncovering the Secrets of Nature. London: Marshall Editions Ltd. 240 p.
• 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. 1964. The birds of Costa Rica: Distribution and Ecology. Bulletin of The American Museum of Natural History 128: 5-430
• Starck and Ricklefs (1998) Avian growth rate data set. In: Avian Growth and Development: Evolution Within the Altricial-Precocial Spectrum (J. M. Starck and R. E. Ricklefs (eds.)), pp. 381-423. Oxford University Press: New York.
• 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. 1983. Checklist of birds. Pp. 530-544, In: D.H. Janzen (ed.). Costa Rican Natural History. University of Chicago Press, Chicago.
• Stiles, F.G. 1990. La avifauna de la Universidad de Costa Rica y sus alrededores através de veinte años (1968-1989). Rev. Biol. Trop. 38(2b): 361-381.
• Summers-Smith, J.D. 2009. Family Passeridae (Old World Sparrows). Pp. 760-813 in: del Hoyo, J., Elliott, A., and D.A. Christie, eds. 2009. Handbook of the Birds of the World, Vol. 14. Bush Shrikes to Old World Sparrows. Lynx Edicions, Barcelona.
• The Birds of North America Online (Online source)