PUTRI ANZELI SIMANGUNSONG; CHRISTINA N SARAGI; KAMMER SIPAYUNG. Politeness strategy used by President Barack Obama speech. Jurnal Onoma: Pendidikan, Bahasa, dan Sastra, [S. l.], v. 10, n. 2, p. 1542–1548, 2024. DOI: 10.30605/onoma.v10i2.3502. Disponível em: https://e-journal.my.id/onoma/article/view/3502. Acesso em: 18 aug. 2025.