1. 1. Christos G. Karydas, lonnis Z. Gitas, Eirini Koutsogiannaki, Nikolaos Lydakis Simantiris and Georgios N. Silleos, “ Evaluation of spatial interpolation technique for mapping of agriculture Topsoil properties in Crete” EARSel proceedings 8, 2009.
   2. Ali Keshavrazi, Fereydoon, Sarmadian, “Mapping of Spatial distribution of Soil Alkalinity in a Semi-arid Region”, Annals of Warsaw University of Life Sciences, Land Reclamation No. 44(1), 2012.
   3. Keshav K. Deshmukh and Sainath P. Aher, “Particle Size Analysis of Soils and Its Interpolation using GIS Technique from Sangamner Area, Maharashtra, India”, Int. Res. J. Environment Sci. Vol. 3(5), pp. 32-37, October 2014.
   4. D.P. Kalivas, D.P. Triantakonstantis, V.J. kollias, “Spatial Prediction of Two soil properties using topographic Information”, Global Nest: The Int. J. , Vol. 4, No. 1, pp. 41-49, 2002.
   5. Avvaru Tharun, T.Ramprasanna Reddy, “GIS-GPS based study of soil Index Properties for Kavali town ( North Region)”, International Journal & Magazine of Engineering, Technology, Management and Research, Vol. 3, Issue 8, 2016.