Ridho, Alvin Ichwannur, and Nurhadi Siswanto. “Improving Coal Loading and Unloading Performance at Loading and Unloading Terminals With Lean Thinking Concept”. Journal Research of Social Science, Economics, and Management, vol. 4, no. 12, July 2025, pp. 2295-03, doi:10.59141/jrssem.v4i12.927.