Biblio

M. Smith and Ball, S., “Waste stabilization ponds”, Waterlines, an international journal of water, sanitation and waste, vol. no. 10, pp. p. 15-18 : techn.drwng, 2004.

S. Ball, Pickford, J., and 7, W. E. D. C. Conference, “Water, people and waste in developing countries : 7th WEDC Conference, 23 -25 September 1981 : proceedings”. Water, Engineering and Development Centre, Loughborough University of Technology, WEDC, Loughborough, UK, p. 112 p.: fig., tab., 1982.

S. Ball and Pickford, J., “Water and waste engineering in Africa : proceedings of the 6th WEDC Conference 24-28 March 1980 at Ahmadu Bello University, Zaria, Nigeria”. Water, Engineering and Development Centre, Loughborough University of Technology, WEDC, Loughborough, UK, p. 203 p., 1981.