1. American Public Health Association (APHA), American Water Works Association (AWWA), Water Pollution Control Federation (WPCF), 1989. Standard Methods for the Examination of Water and Wastewater, 17th ed.
2. Spatial and temporal patterns of groundwater chemistry in the river riparian zone;Banaszuk;Agriculture, Ecosystems and Environment,2005
3. British Geological Survey (BGS), Ministry of Public Health (MOPH), 1994. Impact of urbanization on groundwater: Hat Yai. Final Report. Technical Report WC/94/43, British Geological Survey, Keyworth, Nottingham, UK.
4. Groundwater phosphate dynamics in a river riparian zone: effects of hydrologic flow paths, lithology and redox chemistry;Carlyle;Journal of hydrology,2001
5. A Compendium on Environment Statistics,1998