GUSTI BAYU MANDASTANA. Conceptual Synthesis of Teachers’ Etiquette (At-Tibyan) and The Four Pillars of Professional Teacher Competency: A Systematic Literature Review. International Journal of Islamic Educational Research, [S. l.], v. 3, n. 2, p. 34–42, 2026. DOI: 10.61132/ijier.v3i2.540. Disponível em: https://international.aripafi.or.id/index.php/IJIER/article/view/540. Acesso em: 5 jun. 2026.