Hutasoit PSJK, Tobing SJL, Lumbantoruan R, Mangani KS, Manullang RM. Discussion Regarding the Development of Lake Toba Geopark Tourism and Inter-Regional Cooperation with the Management Agency Toba Caldera UNESCO Global Geopark. cs [Internet]. 2023 Apr. 17 [cited 2025 Apr. 12];5(1):1105-23. Available from: http://ejournal.uki.ac.id/index.php/cs/article/view/4620