1. DRASTIC: A Standardized System for Evaluating Ground Water Pollution Potential Using Hydrogeologic Settings, EPA/600/2-87/035;Aller,1987
2. Al-Rashidy S., 1999. Hydrogeologic controls of groundwater in the shallow manteled karst aquifer. Copperhead Spring, Savoy Experimental Watershed, Northwest Arkansas. MS Thesis. University of Arkansas.
3. Opportunities and limitations of GIS-based modeling of solute transport at the regional scale;Burrough,1996
4. Principles of Geographical Information Systems;Burrough,1998
5. Fuzzy classification methods for determining land suitability from soil profile observations and topography;Burrough;Jounal of Soil Science,1992