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.
S. Gabbay,
«The environment in Israel». Israel, Ministry of the Environment, Jerusalem, Israel, p. xiii, 255 p. : fig., tab., 1994.