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Alton, R. (1999) A breWorld Technical Article. Available online:        http://www.rpi.edu/dept/chem-eng/Biotech-Environ/beer/water2.htm

Food and Agriculture Organization of the United Nations. (2006) Water  Quality for Agriculture. Available online:                     http://www.fao.org/DOCREP/003/T0234E/T0234E06.htm 

Nardi, J.B. (2003) The World Beneath Your Feet: A Guide to Life the    Soil

Wikimedia Foundation (2006) Yeast. Available online: http://en.wikipedia.org/wiki/Yeast#Growth_environment

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