EMMY ERWINA; LISNA SARI SIREGAR; BIMA PRANA CHITRA; RAYYAN NAUFAL; MUHAMMAD RADIT ARDIANSYAH PUTRA. THE INFLUENCE OF LINGUISTIC POLITENESS STRATEGIES ON EFFECTIVE CLASSROOM INTERACTION AND STUDENT COMMUNICATION PERFORMANCE IN UNIVERSITAS HARAPAN MEDAN. Vernacular: Linguistics, Literature, Communication and Culture Journal, [S. l.], v. 5, n. 2, p. 438–451, 2026. Disponível em: https://jurnal.harapan.ac.id/index.php/Vernacular/article/view/1532. Acesso em: 26 jul. 2026.