Putra, Harry Rahmadi, Fandra Nanda, Yusra Hadi, Agus Wibowo, and Dio Putera Hasian. “Sistem Rantai Pasok Pupuk Area”. Jurnal Optimasi Sistem Industri 10, no. 2 (October 4, 2011): 166–172. Accessed June 29, 2022. https://josi.ft.unand.ac.id/index.php/josi/article/view/139.