1. Adler , J. Cook , W.J. The Browning of America Newsweek 1981
2. Our Most Precious Resource-Water;Canby;National Geographic,1980
3. Why Consider Water Conservation?;Sharpe;Jour. AWWA,1978
4. Rump , M.E. Potential Water Economy Measures in Dwellings: Their Feasibility and Economics Bldg. Res. Establishment Current Paper Garston, Watford, U.K. 1978