1. Ghaly, A. E. (1982), Ph.D. thesis, Department of Agricultural Engineering, McGill University, Montreal, Quebec.
2. Loehr, R. C. (1974),Agricultural Waste Management: Problems, Processes and Approaches. Academic Press, New York.
3. Stainer, R. J., Adelberg, E. A., Ingraham, J. L., and Wheelis, M. L. (1979),Introduction to Microbial World. Prentice-Hall, New Jersey.
4. Robinson, K. and Loehr, R. C. (1974),Crit. Rev. Environ. Cont. 4(2), 193–217.
5. Coackley, P. and O'Neill, J. (1975),J. Water Poll. Contr. 74(4), 404–414.