1. World Health Organization (WHO). WHO handbook on indoor radon. ISBN 978-92-4-154767-3 (2009)
2. Nisar, A.; Mohamad, S.J.; Sohail, A.K.: Corelation of radon exhalation rate with grain size of soil collected from Kedah. Malay. Sci. Int. 26(2), 691–696 (2014)
3. Nahida, K.M.; Unis, M.A.: Measurement of Radon-222 exhalation rate in different kinds tablet medicine samples by Detectors CR-39. J. Kerbala Univ. 10, 221–227 (2012)
4. ICRP: Biological effects after prenatal irradiation (embryo and fetus). Publication 90 for the International Commission on Radiological Protection. Pergamon (2004)
5. Ahmad, N.; Jaafar, M.S.; Khan, S.A.; Nasir, T.; Ahmad, S.; Rahim, M.: Measurement of radon exhalation rate, radium activity and annual effective dose from bricks and cement samples collected from Dera Ismail Khan. Am. J. Appl. Sci. 11, 240–247 (2014)