1. Ward, O.P. 1995.Fermentation Biotechnology, Principles, Process, and Products, 227Chichester: Wiley Biotechnology Series.
2. Food fermentations: role of microorganisms in food production and preservation
3. Waites, M.J., Morgan, N.L., Rockey, J.S. and Higton, G. 2001.Industrial Microbiology: An Introduction, 288London: Blackwell Science Ltd.