Proceedings 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. 190-193
Environmental Conservation: Role of Plant Physiology: Proceedings of the 25th Malaysian Society of Plant Physiology Conference (MSPPC 2015) : Ipoh, Perak (Malaysia), 18-20 Aug 2015, p. 2-5