R. J. Garlick,
“Pipeline rehab completed in India”,
Water and wastewater international, pp. p. 41-43 : fig., photogr., 1989.
G. A. Bridger,
Water quality and treatment, vol. no. D3. Ratmalana, Sri Lanka: National Water Supply and Drainage Board, 1989, p. iv, 182 p.: fig., tab.