Rotua Nainggolan, Freddy Marihot, Tarcicius Yoyok Wahyu Subroto, and Agam Marsoyo. “The Value of Gotong-Royong in the Mountainous Settlement of Kepuharjo Village at Pagerjurang Permanent Shelter in Yogyakarta, Indonesia”. International Journal of Built Environment and Sustainability 8, no. 3 (August 30, 2021): 93–106. Accessed April 19, 2024. https://ijbes.utm.my/index.php/ijbes/article/view/822.