Z. M. University Lusaka, Wallingford, G. B. H. R. Walling, KwaDlangezwa, Z. A. University, ZW, Z. Ministry o, y Harare, Z. W. University,
«Handbook for the assessment of catchment water demand and use». HR Wallingford, Wallingford, UK, p. x, 190, 37 p. : 62 fig., tab., 2003.