N. Herath, «Optimisation of local resources for hand-dug wells», in Towards the millennium development goals - actions for water and environmental sanitation : proceedings of the 29th WEDC conference, Abuja, Nigeria, 2003, Loughborough, UK, 2003, pp. p. 196-199 : 4 photogr., 2 tabs.
2000
S. Collins, Hand-dug shallow wells, vol. no. 5. St. Gallen, Switzerland: SKAT (Swiss Centre for Development Cooperation in Technology and Management), 2000, p. 92 p. : boxes, fig., tab.
E. Chimbunde y Mtero, S., «Zimba(b)we's upgraded well programme», in Infrastructure, environment, water and people : proceedings of the 17th WEDC Conference, United Nations Centre for Human Settlement (Habitat), Nairobi, Kenya, 19-23 August 1991, 1991, pp. P. 111-113: 1 fig., 2 tab.