Bakar RA, Fitri M, Hidayat Y, Ma'mun A, Lardika RA. The effectiveness of outdoor education on positive youth development and 21st century skills. J. Sport Area [Internet]. 2024 Nov. 28 [cited 2026 Jul. 23];9(3):440-5. Available from: https://journal.uir.ac.id/index.php/JSP/article/view/16758