DEWI, prasticia chandra. Analisis Perhitungan Biaya Penambangan Batu Silika Pada Departemen Tambang PT Semen Padang. Jurnal Optimasi Sistem Industri, Padang, ID, v. 10, n. 1, p. 93–104, 2011. DOI: 10.25077/josi.v10.n1.p93-104.2011. Disponível em: https://josi.ft.unand.ac.id/index.php/josi/article/view/128. Acesso em: 3 may. 2024.