[1]
Simanjorang, L.P. et al. 2018. Economic Valuation of Sipiso-piso Waterfall with Travel Cost Method and Willingness to Pay. Jurnal Silva Tropika. 2, 2 (Dec. 2018), 52–58. DOI:https://doi.org/10.22437/jsilvtrop.v2i3.5423.