ZAHRA, Ratih Syalaisyah Az; WULANDARI, Desi. Development of Happy Notes PERUGI Learning Media (Energy Transformation) Based on Problem Based Learning to Improve Student Learning Outcomes in Natural and Social Science Subjects in Grade IV of Elementary School. Jurnal Penelitian Pendidikan IPA, [S. l.], v. 11, n. 3, p. 954–969, 2025. DOI: 10.29303/jppipa.v11i3.10992. Disponível em: https://jppipa.unram.ac.id/index.php/jppipa/article/view/10992. Acesso em: 3 jun. 2025.