Ibnu, Muhammad. “Dampak Kebijakan Billing System Penebusan Pupuk Subsidi Di Provinsi Lampung ”. Jurnal Sosial Ekonomi Pertanian 17, no. 3 (November 15, 2021): 59–73. Diakses November 21, 2024. https://journal.unhas.ac.id/index.php/jsep/article/view/14994.