1. State-of-the-Art Instruments for Measuring Radon/thoron and Their Progeny in Dwellings-A Review
2. NCRPMeasurement of Radon and Radon Daughters in Air Report97 National Council on Radiation Protection and Measurements Bethesda MD USA 1988.
3. NCRPA Handbook of Radioactivity Measurements Procedures Report58 2nd edition National Council on Radiation Protection and Measurements Bethesda MD 1985.
4. EPA Home Buyer's and Seller's Guide to Radon (http://www.epa.gov).