1. Abdel-Rahman, M., 1992. Geochemical, mineralogical and sedimentological studies on phosphorites of the Nile valley (Duwi Formation) between Qena and Idfu, Egypt. Ph.D. thesis. Technischen University, Berlin, Germany.
2. Abbady, A.G.E., 1994. Natural radioactivity measurements of some sedimentary rocks in Upper Egypt, M.Sc. thesis, Assiut University, Egypt.
3. Estimation of radiation hazard indices from sedimentary rocks in Upper Egypt;Abbady;Applied Radiation and Isotopes,2004
4. Standard Method for Sampling Surface Soils for Radionuclides;ASTM, American Society for Testing Materials,1983
5. ASTM, American Society for Testing Materials, 1986. Recommended practice for investigation and sampling soil and rock for engineering purposes. Annual Book of ASTM Standards; (04.08) Report No.D, 420, Philadelphia, PA, ASTM, pp. 109–113.