G. Bocco, de Brouwer, H., y Karanga, F.,
«Modelling water resources and water demand in semi-arid areas : data integration and analysis using a geographic information system : a case study in Samburu District, northwestern Kenya, using .. (ILWIS)», vol. no. 2. UNESCO International Hydrological Programme, UNESCO-IHP, Paris, France, p. iv, 62 p. : fig., maps, tab., 1994.