Shuib A, Matthew NK, Ramachandran S, and Mohammad-Afandi SH. “ECONOMIC VALUATION USING TRAVEL COST METHOD (TCM) IN KILIM KARST GEOFOREST PARK, LANGKAWI, MALAYSIA”. Journal of Tropical Forest Science (JTFS), vol. 31, no. 1, Jan. 2019, pp. 078-89, https://jtfs.frim.gov.my/jtfs/article/view/175.