1. Review of Geostatistics in Geohydrology;ASCE (American Society of Chemical Engineers;I: Basic Concepts. Journal of Hydraulic Engineering,1989
2. ASTM (American Society for Testing and Materials 1994 Standard Guide for the Concepts of Geostatistcal Site Investigation Report. D 5549-94, Philadelphia, Pennsylvania
3. ASTM (American Society for Testing and Materials 1996 Standard Guide for Analysis of Spatial Variation in Geostatistcal Site Investigation. D 5523-96, Philadelphia, Pennsylvania