SOPIAN, D.; SOEDARWATI, E.; ARIFIANI, R. . Analisis Portofolio Produk Pupuk Urea, Pupuk NPK dan Amoniak PT Pupuk Kujang. Jurnal Bisnis, [S. l.], v. 12, n. 2, p. 54–63, 2024. DOI: 10.62739/jb.v12i2.80. Disponível em: https://jurnal.stieb-perdanamandiri.ac.id/index.php/ilejurnalojs/article/view/80. Acesso em: 6 mar. 2025.