Proceedings of the Soils Science Conference of Malaysia 2008 : Sustaining Soil Ecosystems with Emphasis on Coastal Soils: Perak (Malaysia), 15-17 April 2008, p. 202-207
Proceeding of the Soil Science Conference of Malaysia 2005: advances in soil science for sustainable food production: Sungai Petani, Kedah (Malaysia), 12-13 Apr, 2005, p. 212-214