Simanjorang, L. P., Banuwa, I. S., Safe’i, R. and Setiawan, A. (2018) “Economic Valuation of Sipiso-piso Waterfall with Travel Cost Method and Willingness to Pay”, Jurnal Silva Tropika, 2(2), pp. 52-58. doi: 10.22437/jsilvtrop.v2i3.5423.