Sinaga, Bahrain Boru. “Analisis Sistem Rantai Pasok Pt. Semen Gresik (Persero) Tbk”. Jurnal Optimasi Sistem Industri 10, no. 1 (April 30, 2011): 105–112. Accessed May 6, 2024. https://josi.ft.unand.ac.id/index.php/josi/article/view/138.