References
- Cappuccino , J. G. and Sherman , N. 1992 . Microbiology. A laboratory manual , 3rd edn. , Redwood City, , USA : Benjamin/Cummings .
- Harley , J. P. and Prescott , L. M. 1990 . Laboratory exercises in microbiology , 1st edn. , Dubuque, , USA : Brown .