Proceedings of the International Conference on In-situ and Ex-situ Biodiveristy Conservation in the New Millennium: Sabah (Malaysia), 20-22 Jun 2000, p. 127-136
Proceedings of the Soils Science Conference of Malaysia 2008: Sustaining Soil Ecosystems with Emphasis on Coastal Soils: Perak (Malaysia), 15-17 Apr 2008, p. 4-8