8National Archives. The water supply (water quality) regulations [ S]. London : National Archives, 1999.
9NHMRC. Australian drinking water guidelines [ S ]. Sydney: NHMRC, 1996.
10The federal-provincial-territorial committee on drinking water of the federal-provincial-territorial committee on health and the environment. Guidelines for canadian drinking water quality [ S]. Canada:FPT Committee on Drinking Water,2004.