1. Health Effects Relating to Direct and Indirect Reuse of Waste Water for Human Consumption;World Health Organization,1975
2. Reclaimed water: a health hazard?;Hattingh;Water S. A.,1977
3. A Water Authority viewpoint on monitoring;Brewin;Chem. Ind.,1980
4. Water Resources in England and Wales;Water Resources Board,1973
5. Water reuse in California;Ongerth,1977