1. Radon in the Environment;Wilkenin,1990
2. Radon: A Tracer for Geological, Geophysical and Geochemical Studies;Baskaran,2016
3. Nuclear Radiation and Health Effectshttp://www.world-nuclear.org/information-library/safety-and-security/radiation-and-health/nuclear-radiation-and-health-effects.aspx
4. WHO Handbook on Indoor Radon: A Public Health Perspective,2009