Biblio

Water and Sanitation Program -Washington, DC, US, WSP, «Willingness to charge and willingness to pay : the World Bank-assisted China rural water supply and sanitation program». Water and Sanitation Program, WSP, Washington, DC, USA, p. 8 p. : 1 fig., photogr., 3 tab., 2002.

Water and Sanitation Program -Washington, DC, US, WSP, «Multi-village rural water supply schemes : an emerging challenge». Water and Sanitation Program, WSP, Washington, DC, USA, p. 18 p. : fig., photogr., tab., 2001.