DANTIC, Marshall James P. Development and Validation of Instructional Material in Astronomy. International Journal of Multidisciplinary: Applied Business and Education Research, Malang, Indonesia, v. 4, n. 1, p. 19–26, 2023. DOI: 10.11594/ijmaber.04.01.03. Disponível em: https://ijmaberjournal.org/index.php/ijmaber/article/view/36. Acesso em: 24 jan. 2026.