References

Alderfer, J. 2006. Complete birds of North America. National Geographic Society,
         Washington D.C., USA.  

Aquarium of the Pacific: online learning center 2010.
         <URL:http://www.aquariumofpacific.org/onlinelearningcenter/full_description/
       bufflehead/>. Accessed 3 April 2010.

Delacour, J. 1959. The waterfowl of the world. Country Life Limited, London, England.  
 
del Hoyo, J., A. Elliott and J. Sargatal. 1992. Handbook of the birds of the world. Lynx
         Edicions, Barcelona, Spain.

Discover life 2010. <URL: http://www.discoverlife.org/mp/20q?search=Bucephala+albeola>.
        Accessed 3 April 2010.
 
Gauthier, G. 1993. The birds of North America. The American Ornithologists’ Union and The
        Academy of Natural Sciences of Philadelphia, Philadelphia, Pennsylvania, USA.  

Johnsgard, P.A. 1975. Waterfowl of North America. Fitzhenry & Whiteside Limited, Don
        Mills, Ontario, Canada.

Seattle Audobon society: for birds and nature 2008. <URL:
      http://www.seattleaudubon.org/birdweb/bird_details.aspx?id=88>. Accessed 6 April
        2010.

Smithsonian national zoological park 2010. <URL: http://nationalzoo.si.edu/Animals/Birds/
      Facts/FactSheets/fact-bufflehead.cfm>. Accessed 4 April 2010.

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