References

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Encyclopedia of Life 2012. <URL: http://eol.org/dataobjects/14878122> . Accessed 3 November 2012.

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Hickman, C.P., L.S. Roberts, S.L. Keen, A. Larson, and D.J. Eisenhour. 2012. Animal Diversity. 6th edition. McGraw-Hill, New York City, New York, USA.

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Nichols, D. 1971. The Oxford Book of Invertebrates. Oxford University Press, Ely House, London, England.

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