AMRI AMANULLOH, Mochammad Ja’far; MARBUN, Marlina; SOBRI, Ahmad Yusuf; UBAIDILLAH, Aan Fardani. 21st Century Skills Development in Secondary Schools: A Systematic Literature Review. Education and Human Development Journal, [S. l.], v. 9, n. 3, p. 212–225, 2024. DOI: 10.33086/ehdj.v9i3.5522. Disponível em: https://journal2.unusa.ac.id/index.php/EHDJ/article/view/5522. Acesso em: 21 aug. 2026.