SAPUTRA, H. .; ITALINA, C. . The Role of Principal’s Leadership in Improving the Quality of Mathematics Education at Junior High School Kembang Tanjong. Journal of Management Science (JMAS), [S. l.], v. 3, n. 4, p. 98–102, 2020. Disponível em: https://exsys.iocspublisher.org/index.php/JMAS/article/view/75. Acesso em: 18 apr. 2026.