Setiyani, A. D., de Fraiture, C., Susanto, R. H. and Duker, A. (2017) “Economic valuation for water supply from Merapi Volcano National Park Case study: Kali Kuning sub watershed”, Journal of Natural Resources and Environmental Management, 7(1), pp. 29-36. doi: 10.29244/jpsl.7.1.29-36.