G. P. Westerhoff,
“Direct and indirect water re-use”,
Water supply : the review journal of the International Water Supply Association, pp. p. IR 9.1 - 9.29 : fig., tab., 1994.
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.
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.