Sinaga, Triwanci, Mian Siahaan, and Dearlina Sinaga. “The Potential Of Promise Waterfall As A Tourist Attraction in The Context of Tourism Development In Baktiraja, Humbang Hasundutan Regency”. International Journal of Management and Business Economics 4, no. 3 (May 31, 2026): 258–275. Accessed June 7, 2026. https://putrapublisher.org/index.php/jamis/article/view/1615.