TORANG SIREGAR. Stages of Research and Development Model Research and Development (R&D). DIROSAT: Journal of Education, Social Sciences & Humanities, [S. l.], v. 1, n. 4, p. 142–158, 2023. DOI: 10.58355/dirosat.v1i4.48. Disponível em: https://dirosat.com/index.php/i/article/view/48. Acesso em: 22 dec. 2024.