1. Corley RHV, Tinker B (2003) The oil palm. Blackwell Science, pp 562
2. Ecoinvent Center (2004) The life cycle inventory data version 1.1, Swiss Centre for Life Cycle Inventories, Dübendorf, 2004, CD-ROM
3. EPA (1994) Contract Emissions No. 68-D2-0159. Factor documentation for AP-42 Section 9.2.2, Pesticide application, Midwest Research Institute, Kansas City, MO
4. Esnan AG, Zin ZZ, Mohd Basri W (2004) Perusahaan sawit di Malaysia- Satu panduan, Edisi Melenium. Lembaga Minyak Sawit Malaysia, pp 63–90
5. FAO (2004) Fertilisers used by crops in Malaysia. FAO corporate document depository. Produced by Natural Resources Management and Environment Department. http://www.fao.org/docrep/007/y5797e/y5797e00.htm