T. Nakashizuka, Zulkifli Yusop, and Abdul Rahim Nik. 1992. “ALTITUDINAL ZONATION OF FOREST COMMUNITIES IN SELANGOR, PENINSULAR MALAYSIA”. Journal of Tropical Forest Science (JTFS) 4 (3):233-44. https://jtfs.frim.gov.my/jtfs/article/view/2003.