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Citations

1 http://www.stephenjaygould.org/library/gould_panda's-thumb.html
2 http://www.sarep.ucdavis.edu/worms/earthworm-ecology-and-sustaining-agriculture
3 http://www.ars.usda.gov/News/docs.htm?docid=15572
4 http://wwwnc.cdc.gov/eid/article/15/7/08-1083_article.htm#r7
5 http://dsc.discovery.com/news/2009/05/19/biodiversity-disease.html

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