Proceedings of the National Symposium on Oil Palm By-products for Agro-based Industries, Institut Penyelidikan Minyak Kelapa Sawit Malaysia, Bangi, Selangor (Malaysia): Kuala Lumpur, 5-6 Nov 1985, p. 16
Proceedings Regional Workshop on Impact of Man's Activities on Tropical Upland Forest Ecosystems: Serdang, Selangor (Malaysia), 3-6 Feb. 1986, p. 99-104