Simandjorang, Bonataon Maruli Timothy Vincent, et al. “Environmental Conservation Based on Community Empowerment: Case Study in Toba Caldera UNESCO Global Geopark”. Jurnal Bina Praja, vol. 14, no. 3, Dec. 2022, pp. 517-2, doi:10.21787/jbp.14.2022.517-527.