Hutasoit, P. S. J. K.; Tobing, S. J. L.; Lumbantoruan, R.; Mangani, K. S.; Manullang, R. M. Discussion Regarding the Development of Lake Toba Geopark Tourism and Inter-Regional Cooperation With the Management Agency Toba Caldera UNESCO Global Geopark. cs 2023, 5, 1105 - 1123.