Select general bird reference sources
Bird Coloration (2 vols.) - Hill, G. E. and K. J. McGraw, eds.
ISBN: 9780674018938
Publication Date: 2006
Speciation and Biogeography of Birds - Newton, I.
ISBN: 012517375X
Publication Date: 2003
Conserving Bird Biodiversity - Norris, K. and D. Pain
ISBN: 0521789494
Publication Date: 2002
Handbook of the Birds of the World (15+ vols.)
ISBN: 9788487334108