| 1 | Wastewater Microbiology, G. Bitton, Wiley Series in Ecological and Applied Microbiology, 2005 |
| 2 | Biological Wastewater Treatment, C.P.L. Grady, Jr.,G.T., Daigger, H.C.Lim, Marcel Dekker, Inc., NY, 1999. |
| 3 | Environmental Biotechnology: Principles and Applications, Bruce E. Rittmann, Perry L. McCarty, McGraw Hill, 2001 |