JR Vincent, RT Carson, KA Schwabe, JR Vincent, A Ismariah, SK Chong, and YT Chang. “DESIGNING AND IMPLEMENTING SURVEYS TO VALUE TROPICAL FORESTS”. Journal of Tropical Forest Science (JTFS), vol. 27, no. 1, Jan. 2015, pp. 92-114, https://jtfs.frim.gov.my/jtfs/article/view/899.