N. Herath,
Manual 1, Latrine Construction, Revised Edition. Nugegoda, Sri Lanka: NORAD, Norwegian Agency for Development Cooperation, 2001, p. 52 p. + 14 p. annexes : fig., 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.
