1. Ahmad, N., Rehman, J. U., Rafique, M., & Nasir, T. (2017). Age-dependent annual effective dose estimations of 226Ra, 232Th, 40K and 222Rn from drinking water in Baling, Malaysia. Water Science and Technology: Water Supply, 18(1), 32–39.
2. Aiken, S. R., Leigh, C. H., Leinbach, T. R., & Moss, M. R. (1982). Development and environment in Peninsular Malaysia. Singapore: McGraw-Hill.
3. Akoto, O., & Adiyiah, J. (2007). Chemical analysis of drinking water from some communities in the Brong Ahafo region. International Journal of Environmental Science & Technology, 4(2), 211–214.
4. Alam, L., Mokhtar, M. B., Alam, M. M., Bari, M. A., Kathijotes, N., Ta, G. C., et al. (2015). Seasonal variation and preliminary risk assessment of trace element pollution in surface water from Langat River, Malaysia. International Journal of Applied Environmental Sciences, 10(1), 19–40.
5. Amarathunga, U., Diyabalanage, S., Bandara, U., & Chandrajith, R. (2019). Environmental factors controlling arsenic mobilization from sandy shallow coastal aquifer sediments in the Mannar Island, Sri Lanka. Applied Geochemistry, 100, 152–159.