1-http://en.wikipedia.org/wiki/Clostridium
2-http://en.wikipedia.org/wiki/Clostridium_botulinum
3-http://www.cehs.siu.edu/fix/medmicro/clost.htm
4-http://www.textbookofbacteriology.net/clostridia.html
5-http://microbewiki.kenyon.edu/index.php/Clostridium
