Proceedings of the Soils Science Conference of Malaysia 2008 : Sustaining Soil Ecosystems with Emphasis on Coastal Soils: Perak (Malaysia), 15-17 April 2008, p. 61-66
Proceedings of the Soil Science Conference of Malaysia 2007: Peat and Other Soil Factors in Crop Production: Sarawak (Malaysia), 17-19 Apr 2007, p. 319-322
Proceedings of the Malaysian Society of Soil Science Conference 2002 : Applications of Modern Tools in Agriculture: Perlis (Malaysia), 23-24 Apr 2002, p. 179-180