S. A. A. Jahn,
“Using Moringa seeds as coagulants in developing countries”,
Journal American Water Works Association, pp. p. 43-50: tab., fig., photogr., 1988.
W. Kirchhof,
“Wastewater treatment in low cost bamboo trickling filters and pond systems”, in
Water pollution control in Asia : proceedings of Second IAWPRC Asian Conference on Water Pollution Control held in Bangkok, Thailand, 9-11 November, 1988, 1988, pp. p. 391-397: fig., tab.
C. Reij, Mulder, P., and Begeman, L.,
Water harvesting for plant production, vol. no. 91. Washington, DC, USA: World Bank, 1988, p. x, 123 p.: fig., tab., photogr.