THE VALIDITY OF LEARNING DEVICES WITH A CONTEXTUAL APPROACH TO IMPROVE CONCEPT UNDERSTANDING ABILITIES. Akademika, [S. l.], v. 9, n. 02, p. 145–159, 2020. DOI: 10.34005/akademika.v9i02.929. Disponível em: https://jurnal.uia.ac.id/akademika/article/view/929. Acesso em: 6 mar. 2026.