Herath, N., 2001. Manual 1, Latrine Construction Revised Edition., (Technical Manual Series on Rural Water Supply and Sanitation) Nugegoda, Sri Lanka: NORAD, Norwegian Agency for Development Cooperation.
Herath, N., 2001. Manual 2, Hand-dug Wells Revised edition., (Technical Manual Series on Rural Water Supply and Sanitation) Nugegoda, Sri Lanka: NORAD, Norwegian Agency for Development Cooperation.