R. F. Carroll,
“Health aspects of latrine construction”, vol. 196. Building Research Establishment, Watford, UK, p. 7 p.: fig., 1991.
R. Franceys, Pickford, J., Hutton, L., and 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.