Sopian, Dede, Ernie Soedarwati, and Rahmawaty Arifiani. “Analisis Portofolio Produk Pupuk Urea, Pupuk NPK Dan Amoniak PT Pupuk Kujang”. Jurnal Bisnis 12, no. 2 (December 31, 2024): 54–63. Accessed March 6, 2025. https://jurnal.stieb-perdanamandiri.ac.id/index.php/ilejurnalojs/article/view/80.