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2. Aller, L., Bennet, T., Lehr, J. H., & Petty, R. J. (1987). DRASTIC: A standardized system for evaluating groundwater pollution potential using hydro geologic settings. USEPA document no. EPA/600/2-85-018.
3. Groundwater vulnerability and risk mapping for the Basaltic aquifer of the Azraq basin of Jordan using GIS, Remote sensing and DRASTIC;Al-Adamat;Applied Geography,2003
4. Population data figures,2001
5. Evaluation of groundwater potential of Musi River catchment using DRASTIC index model;Anwar,2003