SARAGIH, O. K. Professional Development System of Elementary School English Teachers in Indonesia. JURNAL MUTIARA PENDIDIKAN INDONESIA, [S. l.], v. 3, n. 1, p. 1–22, 2018. DOI: 10.51544/mutiarapendidik.v3i1.394. Disponível em: http://e-journal.sari-mutiara.ac.id/index.php/JMT/article/view/394. Acesso em: 25 jun. 2024.