Hermawan, Erwan, dan Widodo Wahyu Purwanto. “Gas Price Policy Analysis for Fertilizer Industries in Indonesia Based on Netback from Final Product”. Jurnal Sosial Humaniora 13, no. 2 (Maret 7, 2025): 190–202. Diakses April 30, 2026. https://journal.its.ac.id/index.php/jsh/article/view/2818.