Bibliography

Griffith, Sarah. Search for the world's 'loneliest whale' who has been singing to himself for 20 years.(July 17th 2013). Daily Mail.  Retrieved from:

http://www.dailymail.co.uk/sciencetech/article-2366727/Scientists-set-worlds-loneliest-whale--admit-idea-looks-like.html

Wikipedia. 52 Hertz Whale. (Jan 12th 2015) Wikimedia Foundation. Retrieved from: 

http://en.wikipedia.org/wiki/52-hertz_whale