KREINSEN , Jens J. The Importance of Marbles in Science Education for Elementary School Children. Assyfa Learning Journal, [S. l.], v. 2, n. 2, p. 99–115, 2024. DOI: 10.61650/alj.v2i2.139. Disponível em: https://journal.assyfa.com/index.php/alj/article/view/139. Acesso em: 27 apr. 2026.