PUTRA, H. R.; NANDA, F.; HADI, Y.; WIBOWO, A.; HASIAN, D. P. Sistem Rantai Pasok Pupuk Area. Jurnal Optimasi Sistem Industri, Padang, ID, v. 10, n. 2, p. 166–172, 2011. DOI: 10.25077/josi.v10.n2.p166-172.2011. Disponível em: https://josi.ft.unand.ac.id/index.php/josi/article/view/139. Acesso em: 29 jun. 2022.