4D Research and Development Model: Trends, Challenges, and Opportunities Review. Jurnal Kajian Ilmiah, [S. l.], v. 25, n. 1, p. 91–98, 2025. DOI: 10.31599/na7deq07. Disponível em: https://ejurnal.ubharajaya.ac.id/index.php/JKI/article/view/3430.. Acesso em: 31 jan. 2025.