KUSTOMO KUSTOMO. Adaptive Principal Leadership in Building Competitive Schools in the VUCA Era in SMP Negeri 4 Jombang. International Journal of Educational Research, [S. l.], v. 3, n. 2, p. 75–85, 2026. DOI: 10.62951/ijer.v3i2.524. Disponível em: https://international.aripi.or.id/index.php/IJER/article/view/524. Acesso em: 7 aug. 2026.