M. H. Birley et Lock, K.,
The health impacts of peri-urban natural resource development. Liverpool, UK: Liverpool School of Tropical Medicine, International Centre for Health Impact Assessment, 1999, p. 185 p. : boxes, fig., tab.
D. Saywell,
« Micro-credit for sanitation ». Water and Environmental Health at London and Loughborough (WELL), London, UK, 1999.