8World Health Organization and UNICEF 2006.MDG Drinking Water and Sanitation Target:The Urban and Rural Challenge of the Decade,MDG Assessment Report,2006.
9Ir Adriana D Hulsmann.Synthesis Report on the Quality of Drinking Water in the European Union Period 1996-1998(Directives 80/778/EEC and 91/692/EEC),2002.
