E. Ministry o EG y IWRA -Urbana, IL, US,
«Satisfying future national and global water demands : proceedings : VIII IWRA world congress on water resources, Cairo, Egypt, November 21 - 25, 1994». International Water Resources Association, Urbana, IL, USA, p. 3 vol. (ca. 700, 700, 100 p.): fig., maps, tab., 1994.
N. Green y Patrick, R.,
«Water industry best practices»,
Journal American Water Works Association, pp. P. 74-79: 2 fig., 5 tab., photogr., 1994.