G. C. White,
The handbook of chlorination, 2nd ed.e ed. New York, NY, USA: Van Nostrand Reinhold, 1986, p. xi, 1070 p. : fig., tab.
B. C. Deb, Sircar, B. K., Sengupta, P. G., De, S. P., Mondal, S. K., Gupta, D. N., Saha, N. C., Ghosh, S., Mitra, U., en Pal, S. C.,
“Studies on interventions to prevent eltor cholera transmission in urban slums”,
Bulletin of the World Health Organization, pp. p. 127-131: fig., tab., photogr., 1986.
Water, Engineering and Development Centre -Loughborough, GB, WEDC en IRC International Water and Sanitation Centre, The Hague, NL,
[.. title in Sinhalese ..] [Practical solutions in drinking water supply and wastes disposal for developing countries], 2nd rev.ed.e ed., vol. no. 20. Ratmalana, Sri Lanka: National Water Supply and Drainage Board, 1986, p. 162 p.: fig.