Khairani, Umi, Nur Ahmadi Bi Rahmani, and Atika Atika. “ Operational Cost Budget Optimization Analysis to Improve Efficiency of PT Citra Robin Sarana”. Quantitative Economics and Management Studies 5, no. 5 (August 3, 2024): 1005–1010. Accessed June 21, 2026. https://qemsjournal.org/index.php/qems/article/view/2813.