1. UNCHS (1987) Global Report on Human Settlements — UN Centre for Human Settlements, Oxford University Press, New York.
2. BGS, ODA, UNEP, and WHO (1996) Characterisation and Assessment of Groundwater Quality Concerns in Asia Pacific Region. UNEP/WHO report UNEP/DEIA/AR/96-1, Nairobi Kenya, pp. 102.
3. Calow, R.C., Morris, B.L., Macdonald, D.M., Talbot, J.C., and Lawrence, AR. (1999) Tools for assessing and Managing Groundwater Pollution Threats in Urban Areas, BGS Technical Report WC/99/18, Keyworth, UK.
4. British Geological Survey and Robens Centre for Public and Environmental Health (2001) Guidelines for Assessing the Risk to Groundwater from On-Site Sanitation, BGS Technical Report (in press).
5. Lazaro, T.R. (1979) Urban Hydrology — A Multi-Disciplinary Perspective, Ann Arbor Science Publishers, Michigan, USA.