Y. Shrestha, «The importance of looking back study in WATSAN projects», 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. 352-354 : 2 fig., 2 photogr., 4 tabs.
N. Herath, Manual 2, Hand-dug Wells, Revised edition. Nugegoda, Sri Lanka: NORAD, Norwegian Agency for Development Cooperation, 2001, p. 71 p. + 9 p. annexes : fig., photogr.