1. Abdullah M (1994) Regression analysis, 1st edn. Dewan Bahasa dan Pustaka, Kuala Lumpur
2. AELB (2006) Atomic Energy Licensing Act 304, Laws of Malaysia. Malaysia Atomic Energy Licensing Boarding-Commisioner of Law Revision, Malaysia. Malaysia National Printing. Bhd., Kuala Lumpur
3. Agocs WB, Paton JR (1958) Airborne magnetometer and scintillation counter survey of Kedah, Perak, Selangor, Terengganu, Pahang, dan Johor. Internal report, Department of Geological Survey, Ipoh
4. Apriantoro NH (2008) Radiological study in Perak State and its radiological health impact. Ph.D. thesis, Universiti Teknologi Malaysia. (in Malay)
5. Chikasawa K, Ishii T, Sugiyama H (2001) Terrestrial gamma radiation in Kochi Prefecture, Japan. J Health Sci 47:361–371