1. Foster S, Chilton J, Moench M, Cardy F, Schiffler M. 2008. Groundwater in rural development: facing the challenges of supply and resource sustainability. The World Bank, Washington, DC.
2. Morris BL, Lawrence ARL, Chilton PJC, Adams B, Calow RC, Klinck BA. 2003. Groundwater and its susceptibility to degradation: a global assessment of the problem and options for management. division of early warning and assessment, United Nations Environment Program, Nairobi, Kenya.
3. UN World Water Assessment Program (WWAP). 2003. The United Nations world water development report: water for people, water for life (executive summary). UNESCO Publishing, Paris, France.
4. Global Groundwater? Issues and Solutions
5. Global Patterns of Groundwater Table Depth