“Design, construction and standardisation of gravity water supply systems in rural villages in Sri Lanka”
. Helvetas, Swiss Association for Development and Cooperation, Nugegoda, Sri Lanka, p. 77 p. + annexes : tech drwngs., 1994.
Drainage principles and applications
, 2nd rev. ed.nd ed., vol. no. 16. Wageningen, The Netherlands: International Institute for Land Reclamation and Improvement, 1994, p. 1125 p. : fig., tab.