R. Franceys, Pickford, J., Hutton, L., et Cotton, A.,
« Watsan 2000 : proceedings of the UNICEF orientation/training workshop for water and sanitation staff : 23-27 July 1990 ». Water, Engineering and Development Centre, Loughborough University of Technology, WEDC, Loughborough, UK, p. 214 p.: drawings, fig., tab., 1991.
