D. Saywell,
«Micro-credit for sanitation». Water and Environmental Health at London and Loughborough (WELL), London, UK, 1999.
D. Saywell y Hunt, C.,
«Sanitation programmes revisited», vol. no.161. Water and Environmental Health at London and Loughborough (WELL), London, UK, p. 55 p. : 6 boxes, 6 fig., 4 tab., 1999.
D. Saywell y Shaw, R.,
«Technical brief no. 61 : on-plot sanitation in urban areas»,
Waterlines, an international journal of water, sanitation and waste, pp. p. 17-20 : 3 drwngs., 4 tab., 1999.