The Effect of Problem-Based Learning on Students’ Cognitive Ability in Vocational Fuel System Learning. Nusantara: Jurnal Pendidikan Indonesia, [S. l.], v. 6, n. 3, p. 591–601, 2026. DOI: 10.62491/njpi.2026.v6i3-3. Disponível em: https://journal.rumahindonesia.org/index.php/njpi/article/view/2735. Acesso em: 18 sep. 2026.