Ilman, and Agung. “Efektivitas Pelaksanaan Quality Control Pada Ultra Filtration Guna Mengefisiensi Energi Di Unit Amoniak 1a PT. Petrokimia Gresik”. Jurnal Indonesia Sosial Sains 2, no. 07 (July 21, 2021): 1115–1132. Accessed June 29, 2025. https://jiss.publikasiindonesia.id/index.php/jiss/article/view/363.