Ardianto, Ivan, Vincent Hadiwiyono, and Tri Mulyaningsih. “The Role of Mining Materials in Group C Against Community Welfare In Ngawi Regency”. Ekuilibrium : Jurnal Ilmiah Bidang Ilmu Ekonomi 13, no. 2 (October 17, 2018): 130–144. Accessed May 26, 2026. https://journal.umpo.ac.id/index.php/ekuilibrium/article/view/892.