Zefri, Zefri, and Sanggam Sanggam. “Development Model of Tourism Area Based on Local Wisdom in Lake Toba, North Sumatra”. Eduvest - Journal of Universal Studies 3, no. 12 (December 25, 2023): 2184–2193. Accessed May 17, 2025. http://www.eduvest.greenvest.co.id.submitjurnal.id/index.php/edv/article/view/1060.