1. Åkerblom G. 1999. Radon Legislation and National Guidelines, 99:18 . Swedish Radiation Protection Institute.
2. Appleton J.D. 2004. Influence of faults on geological radon potential in England and Wales. In: Barnet I. , Neznal M. & Pacherová P. (eds) Radon Investigations in the Czech Republic X and the Seventh International Workshop on the Geological Aspects of Radon Risk Mapping Czech. Geological Survey & RADON corp, Prague.
3. Appleton J.D. 2013. Radon in air and water. In: Selinus O. , Alloway B.J. (eds) Essentials of Medical Geology. Springer, Dordrecht, 239–277.
4. Appleton J.D. & Ball T.K. 1995. Radon and background radioactivity from natural sources: characteristics, extent and the relevance to planning and development in Great Britain. British Geological Survey Technical Report, WP/95/2 .
5. Appleton J.D. & Ball T.K. 2001. Geological Radon Potential Mapping. In: Bobrowsky P.T. (ed.) Geoenvironmental Mapping: Methods, Theory and Practice. Balkema, Rotterdam, 577–613.