Proceedings of the Soils Science Conference of Malaysia 2008 : Sustaining Soil Ecosystems with Emphasis on Coastal Soils: Perak (Malaysia), 15-17 April 2008, p. 163-167
Organic Farming for Sustainable Development: Proceedings of International Conference on Organic Farming Sustainable Development: Sarawak (Malaysia), 6-7 Aug, 2002, p. 1-19