AZRYA, Raudhatul; MEGAWATI, Megawati; HABIBIE , Zulqoidi R. Development of Problem-Based Teaching Materials on Energy Sources With an ESD Approach to Improve Science Process Skills of Fifth-Grade Elementary School Students. Journal of Educational Sciences, [S. l.], v. 10, n. 7, p. 667–681, 2026. DOI: 10.31258/jes.10.7.p.667-681. Disponível em: https://jes.ejournal.unri.ac.id/index.php/JES/article/view/2385. Acesso em: 23 sep. 2026.