Proceedings of the Soil Science Conference of Malaysia 2007: Peat and Other Soil Factors in Crop Production: Sarawak (Malaysia), 17-19 Apr 2007, p. 366-369
Proceedings of the International Conference on In-situ and Ex-situ Biodiversity Conservation in the New Millennium: Sabah (Malaysia), 20-22 Jun 2000, p. 271-278
Proceedings of the Malaysian Society of Soil Science Conference 2002 : Applications of Modern Tools in Agriculture: Perlis (Malaysia), 23-24 Apr 2002, p. 87-90