I. C. Blackett,
« Low-cost urban sanitation in Lesotho », vol. no. 10. World Bank, Washington, DC, USA, p. xiii, 46 p.: boxes, drwngs., photogr., 1994.
C. R. Bartone, Kalbermatten, J. M., et Khouri, N.,
« The reuse of wastewater in agriculture : a guide for planners », vol. no. 6. World Bank, Washington, DC, USA, p. xi, 49 p.: 6 fig., 22 tab., 1994.
J. Hodgkin,
« The sustainability of donor-assisted rural water projects », vol. no. 94. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. ix, 118 p.: 1 tab., 1994.