W. Wiederkehr,
“Policies of tariffs”,
Water supply : the review journal of the International Water Supply Association, pp. p. IR 3.1 - 3.43: fig., tab., 1994.
E. Ministry o EG and IWRA -Urbana, IL, US,
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G. D. J. Atkinson,
“Using water wisely : the public relations aspect”,
Water supply : the review journal of the International Water Supply Association, pp. p. IR 4.1 - 4.30: fig., tab., 1994.