1. Radioactivity levels of 238U and 232Th, the a and b activities and associated dose rates from surface soil in Ulu Tiram, Malaysia;Abdul Rahman;Journal of Radioanalytic and Nuclear Chemistry,2007
2. Basic Population Characteristics by Administrative District;Department of Statistical Malaysia,2010
3. Map of Soil Types in Peninsular Malaysia L-40A Series;Director General of Agriculture Peninsular Malaysia,1973
4. Map of Mineral Resources in Johore State, Malaysia;Director General of Geological Survey,1982
5. Naturally occurring radionuclides in food and water from the Brazilian areas of high radioactivity;Eisenbud,1964