Makki, Ahmat Nuron, Erwin Komara Mindarta, Besar Abadi Prayogi, Sahirul Alim, and Novia Riza. 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):584-607. https://doi.org/10.31004/jh.v6i5.3006.