SY, Suci Rahmawati. “Analisis Perhitungan Biaya Penambangan Batu Silika Pada Departemen Tambang PT Semen Padang”. Jurnal Optimasi Sistem Industri 10, no. 1 (April 27, 2011): 93–104. Accessed March 15, 2025. https://josi.ft.unand.ac.id/index.php/josi/article/view/360.