Proceedings of the Soils Science Conference of Malaysia 2008 : Sustaining Soil Ecosystems with Emphasis on Coastal Soils: Perak (Malaysia), 15-17 April 2008, p. 118-124
Towards modernisation of research and technology in herbal industries: proceedings of the seminar on medicinal and aromatic plants: Kuala Lumpur (Malaysia), 24-25 Jul 2001, p. 47-61