HELMON, Arnoldus. Developing a thematic-integrative instructional kit based on PBL model for fourth graders. Jurnal Prima Edukasia, [S. l.], v. 5, n. 2, p. 125–138, 2017. DOI: 10.21831/jpe.v5i2.8802. Disponível em: https://jurnal.uny.ac.id/index.php/jpe/article/view/8802. Acesso em: 8 jun. 2025.