K. Shordt, Snel, M., y de Graaf, S.,
«School sanitation and hygiene education indicators», in
Towards the millennium development goals - actions for water and environmental sanitation : proceedings of the 29th WEDC conference, Abuja, Nigeria, 2003, Loughborough, UK, 2003, pp. P. 63-65 : 1 tab.
K. Shordt,
«Sustaining hygiene behaviours». Water, Engineering and Development Centre, Loughborough University of Technology, WEDC, Loughborough, UK, p. 3 p., 2003.