1. Abdullah MH, Kassim MA, Hanapi MN (2002) Saltwater encroachment into the sandy aquifer of Manukan island. Borneo Island 12:1–22
2. Alin A (2010) Multicollinearity. Wiley Interdisciplinary Reviews: Computational Statistics 2:370–374
3. APHA (1995) Standard methods for the examination of water and wastewater, 19th edn. American Water Works Association, Water Environment Federation, Washington
4. Aris AZ, Abdullah MH, Ahmed A, Woong KW (2007a) Controlling factors of groundwater hydrochemistry in a small island’s aquifer. Int J Environ Sci Technol 4:441–450
5. Aris AZ, Abdullah MH, Kim KW (2007b) Hydrogeochemistry of groundwater in Manukan island, Sabah. The Malaysian Journal of Analytical Sciences 11:407–413