The following bibliography has been generated by bringing together all references provided by our content partners. There may be duplication.
References
- 1. UNEP-WCMC (November 2001) www.unep-wcmc.org
- 2. Peterson, R.T., Mountfort, G., Hollom. (1993) Collins Field Guide. Birds of Britain and Europe. Harper Collins, London.
- 3. RSPB (November 2001) http://www.rspb.org.uk
- 4. UK Biodiversity (November 2001) http://www.ukbap.org.uk/
- 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. Pyrrhula pyrrhula
- Burton M. and Burton R. 1980. The New Funk and Wagnalls Illustrated Wildlife Encyclopedia, Volume II. BPC Publishing Ltd.
- Gill, Frank, and Minturn Wright. 2006. Birds of the World: Recommended English Names. ix + 259
- Heinzel, H. 1972. The Birds of Britain and Europe. William Collins Sons and Co. Ltd. London.
- Moller (2006) Sociality, age at first reproduction and senescence: comparative analyses of birds. J Evol Biol, 19:682-689.
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