W.C. Woon, W.K. Hoi and Puad Elham (1989) “ECONOMICS OF RUBBERWOOD CHARCOAL PRODUCTION USING THE TRANSPORTABLE METAL KILN”, Journal of Tropical Forest Science (JTFS) , 1(4), pp. 327–335. Available at: https://jtfs.frim.gov.my/jtfs/article/view/2179 (Accessed: 19 May 2024).