1. G. Amente, Advanced Environmental Physics. Haramaya University..
2. Ehitusmaterjalides leiduvatest looduslikest radionukliididest põhjustatud elanikudoosi hinnang;Lust;Proc. Est. Acad. Sci.,2012
3. “Extent of Environmental Contamination by Naturally Occurring Radioactive Material (NORM) and Technological Options for Mitigation,2003
4. United States Environmental Protection Agency Memorandum Subject Guidance-Potential for Radiation Contamination Associated With Mineral and Resource Extraction FROM.” [Online]. Available: www.epa.gov.