Makki, A.N. , Mindarta, E.K., Prayogi, B.A. , Alim, S. and Riza, N. 2026. Problem-Based Learning and Final Cooling-System Competency in Heavy-Duty Diesel Engine Education: A Quasi-Experimental Pretest-Posttest Study. Journal Of Human And Education (JAHE). 6, 5 (Sep. 2026), 584–607.