., Kholil, Nugroho Sukamdani, and Soecahyadi . “Sustainable Tourism Development Using Soft System Methodology (SSM): A Case Study in Padang Panjang Regency West Sumatra, Indonesia”. Arts and Social Studies Research Vol. 1 (April 28, 2020): 54-62. Accessed June 19, 2026. https://stm1.bookpi.org/index.php/assr-v1/article/view/1252.