1. Doak W (1979) The cliff dwellers: an undersea community. Hodder and Stoughton, New Zealand
2. http://answers.yahoo.com/question/index?qid=20080413091945AA
VikPT. Accessed 10 Nov 2009
3. http://nssdc.gsfc.nasa.gov/imgcat/html/object_page/a17_h_148_
22727.html. Accessed 10 Nov 2009
4. Groombridge B, Jenkins MD (2002) World atlas of biodiversity. University of California Press, Berkeley
5. Whittaker RH (1959) On the broad classification of organisms. Quart Rev Biol 34:21–26