Marselina Djayasinga and Ria Virsa (2019) “WILLINGNESS TO PAY (WTP) BY CONTINGENT VALUATION METHOD (CASE STUDY: WASTE MANAGEMENT SERVICES)”, GEOMATE Journal, 17(62), pp. 59–64. Available at: https://geomatejournal.com/geomate/article/view/614 (Accessed: 3 February 2026).