1. Ahmad, A., Zulkefli, M., Ahmed, M., Aminuddin, B., Sharma, M., & Mohd Zain, M. (1996). Environmental impact of agricultural inorganic pollution on groundwater resources of the Kelantan plain, Malaysia. Paper presented at the ACIAR proceedings.
2. Al-Badaii, F., Shuhaimi-Othman, M., & Gasim, M. B. (2013). Water quality assessment of the Semenyih river, Selangor, Malaysia. Journal of Chemistry, 2013.
3. Alberto, W. D., del Pilar, D. A. M. A., Valeria, A. M. A., Fabiana, P. S., Cecilia, H. A., & de los Ángeles, B. M. A. (2001). Pattern recognition techniques for the evaluation of spatial and temporal variations in water quality. A case study: Suquı́a River Basin (Córdoba–Argentina). Water Research, 35(12), 2881–2894.
4. Azlan, A., Aweng, E., Ibrahim, C., & Noorhaidah, A. (2012). Correlation between soil organic matter, total organic matter and water content with climate and depths of soil at different land use in Kelantan, Malaysia. Journal of Applied Sciences and Environmental Management, 16(4).
5. Biddanda, B. A., & Pomeroy, L. R. (1988). Microbial aggregation and degradation of phytoplankton-derived detritus in seawater. I. Microbial succession. Marine Ecology Progress Series, 79-88.